This series consists of talks in the area of Superstring Theory. http://pirsa.org/podcast/S003 Science 2009 http://blogs.law.harvard.edu/tech/rss en-ca Thu, 08 Jan 2009 10:32:28 -0500 sbradwell@perimeterinstitute.ca Thu, 08 Jan 2009 10:32:28 -0500 G 180 sbradwell@perimeterinstitute.ca Steve Bradwell's - Podcast Generator Cliff Burgess http://streamer.perimeterinstitute.ca/mp3/43fcaea8-9dcf-46ab-8d6e-66fc61153c02.mp3 Science http://streamer.perimeterinstitute.ca/mp3/43fcaea8-9dcf-46ab-8d6e-66fc61153c02.mp3 Thu, 07 Oct 2004 14:00:00 -0400 Jim Cline http://streamer.perimeterinstitute.ca/mp3/07764c97-6953-4040-9d46-985ad1b65e91.mp3 Science http://streamer.perimeterinstitute.ca/mp3/07764c97-6953-4040-9d46-985ad1b65e91.mp3 Thu, 14 Oct 2004 09:55:00 -0400 Iosif Bena http://streamer.perimeterinstitute.ca/mp3/b8ce3e41-8431-4d8f-95d8-61a9c7b7ee94.mp3 Science http://streamer.perimeterinstitute.ca/mp3/b8ce3e41-8431-4d8f-95d8-61a9c7b7ee94.mp3 Tue, 19 Oct 2004 10:00:00 -0400 Guatam Mandal http://streamer.perimeterinstitute.ca/mp3/711be65e-9de4-4fc1-8ff5-35571e2c7ccd.mp3 Science http://streamer.perimeterinstitute.ca/mp3/711be65e-9de4-4fc1-8ff5-35571e2c7ccd.mp3 Thu, 28 Oct 2004 14:00:00 -0400 Henriette Elvang http://streamer.perimeterinstitute.ca/mp3/c55f8d8f-e453-4fce-a649-9932b1fac4e5.mp3 Science http://streamer.perimeterinstitute.ca/mp3/c55f8d8f-e453-4fce-a649-9932b1fac4e5.mp3 Thu, 11 Nov 2004 09:50:00 -0500 Arthur Lue http://streamer.perimeterinstitute.ca/mp3/ff333493-5b99-4561-aa92-6e53774a3af2.mp3 Science http://streamer.perimeterinstitute.ca/mp3/ff333493-5b99-4561-aa92-6e53774a3af2.mp3 Thu, 18 Nov 2004 10:45:00 -0500 Oleg Lunin http://streamer.perimeterinstitute.ca/mp3/2de1e4ff-0cfb-4254-a9c9-b96c8d200410.mp3 Science http://streamer.perimeterinstitute.ca/mp3/2de1e4ff-0cfb-4254-a9c9-b96c8d200410.mp3 Thu, 25 Nov 2004 11:05:00 -0500 Lilam McAllister http://streamer.perimeterinstitute.ca/mp3/812dfe51-85b4-4143-9799-eeb57ea91747.mp3 Science http://streamer.perimeterinstitute.ca/mp3/812dfe51-85b4-4143-9799-eeb57ea91747.mp3 Thu, 02 Dec 2004 10:55:00 -0500 Corinne Manogue http://streamer.perimeterinstitute.ca/mp3/704b9bc5-725c-4179-b656-83369832d720.mp3 Science http://streamer.perimeterinstitute.ca/mp3/704b9bc5-725c-4179-b656-83369832d720.mp3 Tue, 07 Dec 2004 13:55:00 -0500 Gautam Mandel http://streamer.perimeterinstitute.ca/mp3/48e795ee-4929-4b65-803c-7d7ad01264ed.mp3 Science http://streamer.perimeterinstitute.ca/mp3/48e795ee-4929-4b65-803c-7d7ad01264ed.mp3 Tue, 18 Jan 2005 11:00:00 -0500 In these two lectures I will present on overview of topological string theory, starting with the basic concepts and continuing to the most recent developments. Aspects that will be covered are: closed and open strings, Gromov-Witten theory, matrix models, quantum crystals, and special holonomy manifolds. I will end with some more speculative thoughts about the non-perturbative definition of (topological) string theory and quantum geometry. Robbert Dijkgraff http://streamer.perimeterinstitute.ca/mp3/93cb3569-c9e6-42ed-a97b-5619cb303a17.mp3 Science http://streamer.perimeterinstitute.ca/mp3/93cb3569-c9e6-42ed-a97b-5619cb303a17.mp3 Tue, 18 Jan 2005 14:00:00 -0500 Ted Jacobson http://streamer.perimeterinstitute.ca/mp3/0eadfd0f-f132-4296-9314-86342aa4afcb.mp3 Science http://streamer.perimeterinstitute.ca/mp3/0eadfd0f-f132-4296-9314-86342aa4afcb.mp3 Wed, 19 Jan 2005 11:00:00 -0500 Leo Rastelli http://streamer.perimeterinstitute.ca/mp3/82678f16-3cd5-451c-8dcb-565e3500a529.mp3 Science http://streamer.perimeterinstitute.ca/mp3/82678f16-3cd5-451c-8dcb-565e3500a529.mp3 Wed, 19 Jan 2005 14:00:00 -0500 Martin Kruczenski http://streamer.perimeterinstitute.ca/mp3/0a017b5c-19da-4ba8-8933-e5c25bd951b0.mp3 Science http://streamer.perimeterinstitute.ca/mp3/0a017b5c-19da-4ba8-8933-e5c25bd951b0.mp3 Tue, 25 Jan 2005 11:00:00 -0500 Oliver DeWolfe http://streamer.perimeterinstitute.ca/mp3/d41d8ef2-f28d-454e-8638-335701be0e4e.mp3 Science http://streamer.perimeterinstitute.ca/mp3/d41d8ef2-f28d-454e-8638-335701be0e4e.mp3 Tue, 01 Feb 2005 11:00:00 -0500 Ofer Aharony http://streamer.perimeterinstitute.ca/mp3/2c4c5d71-c486-4629-a2c1-188cda86cff7.mp3 Science http://streamer.perimeterinstitute.ca/mp3/2c4c5d71-c486-4629-a2c1-188cda86cff7.mp3 Mon, 14 Feb 2005 14:35:00 -0500 Philip Pearle http://streamer.perimeterinstitute.ca/mp3/d7ce7ca8-22e3-46f2-aad2-7bd69dda530b.mp3 Science http://streamer.perimeterinstitute.ca/mp3/d7ce7ca8-22e3-46f2-aad2-7bd69dda530b.mp3 Wed, 16 Feb 2005 16:00:00 -0500 Jeremie Vinet http://streamer.perimeterinstitute.ca/mp3/d35b712c-b2db-4453-a8af-2cdfcd8932ee.mp3 Science http://streamer.perimeterinstitute.ca/mp3/d35b712c-b2db-4453-a8af-2cdfcd8932ee.mp3 Mon, 21 Feb 2005 11:00:00 -0500 Thomas Hertog http://streamer.perimeterinstitute.ca/mp3/79ee1d1e-6d79-4d66-8a93-9b57652ce4fd.mp3 Science http://streamer.perimeterinstitute.ca/mp3/79ee1d1e-6d79-4d66-8a93-9b57652ce4fd.mp3 Tue, 22 Feb 2005 11:00:00 -0500 Moshe Rozali http://streamer.perimeterinstitute.ca/mp3/7037d763-bff6-44fc-8a78-df9de1106134.mp3 Science http://streamer.perimeterinstitute.ca/mp3/7037d763-bff6-44fc-8a78-df9de1106134.mp3 Tue, 22 Feb 2005 14:00:00 -0500 We discuss collective coordinate quantization of the half-BPS geometries of Lin, Lunin and Maldacena (hep-th/0409174). The LLM geometries are parameterized by a single function u on a plane. We treat this function as a collective coordinate. We arrive at the collective coordinate action as well as path integral measure by considering D3 branes in an arbitrary LLM geometry. The resulting functional integral is shown, using known methods (hep-th/9309028), to be the classical limit of a functional integral for free fermions in a harmonic oscillator. The function u gets identified with the classical limit of the Wigner phase space distribution of the fermion theory which satisfies u * u = u. The calculation shows how configuration space of supergravity becomes a phase space (hence noncommutative) in the half-BPS sector. Our method sheds some new light on counting supersymmetric configurations in supergravity. Gautam Mandel http://streamer.perimeterinstitute.ca/mp3/9d844fd6-889c-4d43-ac4e-d1f6ced6b7bc.mp3 Science http://streamer.perimeterinstitute.ca/mp3/9d844fd6-889c-4d43-ac4e-d1f6ced6b7bc.mp3 Wed, 23 Feb 2005 11:00:00 -0500 It was conjectured that the N=4 Yang-Mills perturbation theory in the sector with large R charges corresponds to considering the classical string worldsheets in $AdS_5imes S^5$ as perturbations of the null-surfaces. We discuss this perturbation theory with a special emphasis on a hidden symmetry. Andrei Mikhailov http://streamer.perimeterinstitute.ca/mp3/176f86d5-6615-45ea-bc4f-2ba7a600d813.mp3 Science http://streamer.perimeterinstitute.ca/mp3/176f86d5-6615-45ea-bc4f-2ba7a600d813.mp3 Tue, 01 Mar 2005 14:00:00 -0500 The cosmic microwave background (CMB) is our most direct cosmological observable, encoding critical information about the evolution and development of the universe. The Wilkinson Microwave Anisotropy Probe (WMAP) has measured the angular power spectrum of the CMB temperature and temperature-polarization power spectra with unprecedented accuracy from its first year in flight. These recent observations along with developments in supernovae and galaxy surveys are generating critical challenges for theoretical physics, producing fundamental, intriguing questions in particle physics, cosmology and astrophysics that are as yet unresolved. We discuss in this seminar how the theoretical picture of the nature of dark matter and dark energy, and the origins of the universe, is being guided and modified by observations. Rachel Bean http://streamer.perimeterinstitute.ca/mp3/afb5c8ef-94ac-4983-8898-f398820f4053.mp3 Science http://streamer.perimeterinstitute.ca/mp3/afb5c8ef-94ac-4983-8898-f398820f4053.mp3 Mon, 07 Mar 2005 11:00:00 -0500 Fernando Marchesano http://streamer.perimeterinstitute.ca/mp3/54c5ed1b-8f28-4376-a968-15ae8284a35d.mp3 Science http://streamer.perimeterinstitute.ca/mp3/54c5ed1b-8f28-4376-a968-15ae8284a35d.mp3 Tue, 08 Mar 2005 11:00:00 -0500 Using the numerical data of the UBC group simulation, an analysis is done of the properties of the horizon of an evolving black string. The results are consistent with pinch off in infinite affine parameter David Garfinkle http://streamer.perimeterinstitute.ca/mp3/dbce861f-72ea-4488-bc6a-0d61c25ce5b7.mp3 Science http://streamer.perimeterinstitute.ca/mp3/dbce861f-72ea-4488-bc6a-0d61c25ce5b7.mp3 Wed, 09 Mar 2005 11:00:00 -0500 In this talk I will summarise the recent progress in AdS/CFT due to the construction of the new infinite family of Sasaki-Einstein metrics Y^{p,q}, and their dual superconformal gauge theories. I will review some aspects of Sasaki-Einstein geometry and the main features of the Y^{p,q} metrics. I will then discuss the use of toric geometry to obtain a description of the corresponding Y^{p,q} Calabi-Yau singularities. I will explain how the AdS/CFT dual N=1 supersymmetric gauge theories were constructed using the combined information obtained from the metrics and the toric singularities. A crucial check on the consistency of the construction is provided by the field theory technique of a-maximisation. In the last part of the talk I will briefly discuss the recently formulated geometric dual of this, i.e. "Z-minimisation". Dario Martelli http://streamer.perimeterinstitute.ca/mp3/7c99e684-2cda-43ab-8ebb-6d5765369602.mp3 Science http://streamer.perimeterinstitute.ca/mp3/7c99e684-2cda-43ab-8ebb-6d5765369602.mp3 Tue, 12 Apr 2005 11:00:00 -0400 Dam Son http://streamer.perimeterinstitute.ca/mp3/4debe6b2-b97f-4606-b7b2-7f07aa92ad47.mp3 Science http://streamer.perimeterinstitute.ca/mp3/4debe6b2-b97f-4606-b7b2-7f07aa92ad47.mp3 Tue, 19 Apr 2005 11:00:00 -0400 Axel Krause http://streamer.perimeterinstitute.ca/mp3/f2758408-ae73-4ee2-941c-16818da68226.mp3 Science http://streamer.perimeterinstitute.ca/mp3/f2758408-ae73-4ee2-941c-16818da68226.mp3 Tue, 26 Apr 2005 11:00:00 -0400 Joan Simon http://streamer.perimeterinstitute.ca/mp3/97c4e93f-2e64-4c2e-92e1-e6dd9983f9f2.mp3 Science http://streamer.perimeterinstitute.ca/mp3/97c4e93f-2e64-4c2e-92e1-e6dd9983f9f2.mp3 Tue, 26 Apr 2005 14:00:00 -0400 Niklas Beisert http://streamer.perimeterinstitute.ca/mp3/00a29357-4029-4b58-9425-12f1f19fb5fc.mp3 Science http://streamer.perimeterinstitute.ca/mp3/00a29357-4029-4b58-9425-12f1f19fb5fc.mp3 Tue, 10 May 2005 11:00:00 -0400 Renata Kallosh http://streamer.perimeterinstitute.ca/mp3/ebeabf29-1054-4885-b364-2d670336157b.mp3 Science http://streamer.perimeterinstitute.ca/mp3/ebeabf29-1054-4885-b364-2d670336157b.mp3 Tue, 10 May 2005 14:00:00 -0400 Kris Kennaway http://streamer.perimeterinstitute.ca/mp3/f05b5ba1-d279-4f36-ad7c-5c1d5a300718.mp3 Science http://streamer.perimeterinstitute.ca/mp3/f05b5ba1-d279-4f36-ad7c-5c1d5a300718.mp3 Tue, 17 May 2005 11:00:00 -0400 Tadashi Takayanagi http://streamer.perimeterinstitute.ca/mp3/d993397c-bbc9-4db6-99d9-28bebe7bec15.mp3 Science http://streamer.perimeterinstitute.ca/mp3/d993397c-bbc9-4db6-99d9-28bebe7bec15.mp3 Tue, 17 May 2005 14:00:00 -0400 Axel Brandenburg http://streamer.perimeterinstitute.ca/mp3/155403d6-7673-410c-9a7b-060224235ec2.mp3 Science http://streamer.perimeterinstitute.ca/mp3/155403d6-7673-410c-9a7b-060224235ec2.mp3 Wed, 01 Jun 2005 14:00:00 -0400 Don Marolf http://streamer.perimeterinstitute.ca/mp3/524f1b9c-f4f4-40eb-9d9d-3f3775d6e9eb.mp3 Science http://streamer.perimeterinstitute.ca/mp3/524f1b9c-f4f4-40eb-9d9d-3f3775d6e9eb.mp3 Tue, 07 Jun 2005 02:00:00 -0400 Jorge Russo http://streamer.perimeterinstitute.ca/mp3/df23c58d-4272-4385-9ad7-3a33cca41097.mp3 Science http://streamer.perimeterinstitute.ca/mp3/df23c58d-4272-4385-9ad7-3a33cca41097.mp3 Tue, 14 Jun 2005 14:00:00 -0400 Fractional branes and dynamical SUSY breaking Sebastian Franco http://streamer.perimeterinstitute.ca/mp3/7b12f6a3-04c8-449d-aa2c-bf63040f011e.mp3 Science http://streamer.perimeterinstitute.ca/mp3/7b12f6a3-04c8-449d-aa2c-bf63040f011e.mp3 Tue, 13 Sep 2005 11:00:00 -0400 David Berenstein http://streamer.perimeterinstitute.ca/mp3/5547a882-07ef-4bb1-a51d-0d4eafb56143.mp3 Science http://streamer.perimeterinstitute.ca/mp3/5547a882-07ef-4bb1-a51d-0d4eafb56143.mp3 Tue, 13 Sep 2005 14:00:00 -0400 TBA Ashoke Sen http://streamer.perimeterinstitute.ca/mp3/cda5b8ee-b78c-457d-af96-42cdb5d7e47e.mp3 Science http://streamer.perimeterinstitute.ca/mp3/cda5b8ee-b78c-457d-af96-42cdb5d7e47e.mp3 Tue, 20 Sep 2005 14:00:00 -0400 TBA Lorenzo Cornalba http://streamer.perimeterinstitute.ca/mp3/8166f546-3f82-49a9-8053-5278dc4abe1c.mp3 Science http://streamer.perimeterinstitute.ca/mp3/8166f546-3f82-49a9-8053-5278dc4abe1c.mp3 Tue, 04 Oct 2005 11:00:00 -0400 Sean Hartnoll http://streamer.perimeterinstitute.ca/mp3/e12615c2-a57e-41e6-8ee4-27d96cc3ec21.mp3 Science http://streamer.perimeterinstitute.ca/mp3/e12615c2-a57e-41e6-8ee4-27d96cc3ec21.mp3 Tue, 11 Oct 2005 14:00:00 -0400 Thomas Levi http://streamer.perimeterinstitute.ca/mp3/e1c9fce4-b61a-40cb-a002-b7decb5e1060.mp3 Science http://streamer.perimeterinstitute.ca/mp3/e1c9fce4-b61a-40cb-a002-b7decb5e1060.mp3 Tue, 01 Nov 2005 02:00:00 -0500 Natalia Saulina http://streamer.perimeterinstitute.ca/mp3/8d8a756e-86a1-43fb-9e31-edd5c2f045fa.mp3 Science http://streamer.perimeterinstitute.ca/mp3/8d8a756e-86a1-43fb-9e31-edd5c2f045fa.mp3 Tue, 15 Nov 2005 14:00:56 -0500 Alexander Maloney http://streamer.perimeterinstitute.ca/mp3/849e59f5-d7b7-41a7-a67c-4c2ead88cbff.mp3 Science http://streamer.perimeterinstitute.ca/mp3/849e59f5-d7b7-41a7-a67c-4c2ead88cbff.mp3 Tue, 22 Nov 2005 14:00:00 -0500 Pablo Camara http://streamer.perimeterinstitute.ca/mp3/28342207-b2ae-4987-a257-bd483446447e.mp3 Science http://streamer.perimeterinstitute.ca/mp3/28342207-b2ae-4987-a257-bd483446447e.mp3 Tue, 29 Nov 2005 14:00:12 -0500 Niels Bjerrum-Bohr http://streamer.perimeterinstitute.ca/mp3/da3c8602-7551-41b3-9e8a-109476702804.mp3 Science http://streamer.perimeterinstitute.ca/mp3/da3c8602-7551-41b3-9e8a-109476702804.mp3 Mon, 05 Dec 2005 11:00:23 -0500 Toby Wiseman http://streamer.perimeterinstitute.ca/mp3/ef0cdf34-7bf8-4bac-a3fa-861031fa8f3b.mp3 Science http://streamer.perimeterinstitute.ca/mp3/ef0cdf34-7bf8-4bac-a3fa-861031fa8f3b.mp3 Tue, 06 Dec 2005 14:00:10 -0500 Given the difficulty of studying time-dependent processes in string theory, closed string tachyon condensation problems are often modelled by the process of renormalization group flow on the world-sheet. But what is the quantitative relation between these two processes? In this talk I will give a partial answer to this question, and discuss what it teaches us about closed string tachyon dynamics. Mathew Headrick http://streamer.perimeterinstitute.ca/mp3/41830215-b018-425c-83bc-822032893f73.mp3 Science http://streamer.perimeterinstitute.ca/mp3/41830215-b018-425c-83bc-822032893f73.mp3 Wed, 07 Dec 2005 11:00:07 -0500 Dmitry Podolsky http://streamer.perimeterinstitute.ca/mp3/a79a6a3d-47f5-45b4-826d-d68da9baf4a0.mp3 Science http://streamer.perimeterinstitute.ca/mp3/a79a6a3d-47f5-45b4-826d-d68da9baf4a0.mp3 Thu, 08 Dec 2005 11:00:42 -0500 David Shih http://streamer.perimeterinstitute.ca/mp3/131b7b21-b12e-46c6-8d57-1f72eaf3e246.mp3 Science http://streamer.perimeterinstitute.ca/mp3/131b7b21-b12e-46c6-8d57-1f72eaf3e246.mp3 Tue, 13 Dec 2005 14:00:56 -0500 Sergio Benvenuti http://streamer.perimeterinstitute.ca/mp3/86ee74d0-815c-446b-aacd-042436275bf4.mp3 Science http://streamer.perimeterinstitute.ca/mp3/86ee74d0-815c-446b-aacd-042436275bf4.mp3 Mon, 19 Dec 2005 14:00:46 -0500 I review our recent work on confinement in 2+1 Yang Mills theory using Karabali-Nair variables. I'll discuss our successful prediction of the glueball spectrum, including the manifestations of the QCD string. Rob Leigh http://streamer.perimeterinstitute.ca/mp3/008eda56-5220-4ffa-9206-9414bdda8425.mp3 Science http://streamer.perimeterinstitute.ca/mp3/008eda56-5220-4ffa-9206-9414bdda8425.mp3 Tue, 17 Jan 2006 14:00:28 -0500 N=2 F-Terms Revisited Nick Halmagyi http://streamer.perimeterinstitute.ca/mp3/7d947c58-ed4f-4eb6-8437-82efcf6f5238.mp3 Science http://streamer.perimeterinstitute.ca/mp3/7d947c58-ed4f-4eb6-8437-82efcf6f5238.mp3 Tue, 24 Jan 2006 14:00:08 -0500 Frederik Denef http://streamer.perimeterinstitute.ca/mp3/c2a80f5b-197c-48f1-a9dc-430d99c146f1.mp3 Science http://streamer.perimeterinstitute.ca/mp3/c2a80f5b-197c-48f1-a9dc-430d99c146f1.mp3 Tue, 07 Feb 2006 14:00:15 -0500 Martin Kruczenski http://streamer.perimeterinstitute.ca/mp3/a0b57930-a256-437d-bb6b-0968e0f3eb59.mp3 Science http://streamer.perimeterinstitute.ca/mp3/a0b57930-a256-437d-bb6b-0968e0f3eb59.mp3 Mon, 13 Feb 2006 11:00:37 -0500 Chris Beasley http://streamer.perimeterinstitute.ca/mp3/18f2e6d5-08da-4294-91dd-d3c8bcc72b95.mp3 Science http://streamer.perimeterinstitute.ca/mp3/18f2e6d5-08da-4294-91dd-d3c8bcc72b95.mp3 Tue, 14 Feb 2006 14:00:25 -0500 tba Simeon Hellerman http://streamer.perimeterinstitute.ca/mp3/ad14103c-2a8b-45af-bb85-29ab48416b86.mp3 Science http://streamer.perimeterinstitute.ca/mp3/ad14103c-2a8b-45af-bb85-29ab48416b86.mp3 Tue, 21 Feb 2006 14:00:34 -0500 Joaquim Gomis http://streamer.perimeterinstitute.ca/mp3/25d6e2d8-e4de-49a1-9490-040af5d0fc90.mp3 Science http://streamer.perimeterinstitute.ca/mp3/25d6e2d8-e4de-49a1-9490-040af5d0fc90.mp3 Tue, 07 Mar 2006 14:00:49 -0500 Gordon Semenoff http://streamer.perimeterinstitute.ca/mp3/fa768664-6e69-4404-8e3b-a16b20d1507e.mp3 Science http://streamer.perimeterinstitute.ca/mp3/fa768664-6e69-4404-8e3b-a16b20d1507e.mp3 Tue, 14 Mar 2006 14:00:38 -0500 Jesse Thaler http://streamer.perimeterinstitute.ca/mp3/1b51e9c7-92aa-4406-ae70-66dc721b4144.mp3 Science http://streamer.perimeterinstitute.ca/mp3/1b51e9c7-92aa-4406-ae70-66dc721b4144.mp3 Tue, 21 Mar 2006 11:00:00 -0500 Jesse Thaler http://streamer.perimeterinstitute.ca/mp3/b8b2bd4d-f22f-4ad7-a92b-07424472e736.mp3 Science http://streamer.perimeterinstitute.ca/mp3/b8b2bd4d-f22f-4ad7-a92b-07424472e736.mp3 Tue, 21 Mar 2006 14:00:50 -0500 Michael Douglas http://streamer.perimeterinstitute.ca/mp3/35fcc230-1504-4503-8b60-5263b670c9fd.mp3 Science http://streamer.perimeterinstitute.ca/mp3/35fcc230-1504-4503-8b60-5263b670c9fd.mp3 Tue, 28 Mar 2006 14:00:26 -0500 Eleonora Dell'Aquila http://streamer.perimeterinstitute.ca/mp3/5a068025-b447-4486-8208-7521a238c38f.mp3 Science http://streamer.perimeterinstitute.ca/mp3/5a068025-b447-4486-8208-7521a238c38f.mp3 Tue, 04 Apr 2006 14:00:47 -0400 Kris Kennaway http://streamer.perimeterinstitute.ca/mp3/356b36dd-bf05-4686-a72b-312eb9a57a13.mp3 Science http://streamer.perimeterinstitute.ca/mp3/356b36dd-bf05-4686-a72b-312eb9a57a13.mp3 Tue, 11 Apr 2006 14:00:57 -0400 Nelia Mann http://streamer.perimeterinstitute.ca/mp3/873f4898-eb5a-4f8e-8e1d-110d5e3983ba.mp3 Science http://streamer.perimeterinstitute.ca/mp3/873f4898-eb5a-4f8e-8e1d-110d5e3983ba.mp3 Tue, 18 Apr 2006 14:00:11 -0400 Giuseppe Policastro http://streamer.perimeterinstitute.ca/mp3/e499b2f8-0ecd-484a-93f9-253b717288f8.mp3 Science http://streamer.perimeterinstitute.ca/mp3/e499b2f8-0ecd-484a-93f9-253b717288f8.mp3 Tue, 25 Apr 2006 14:00:09 -0400 Simon Catterall http://streamer.perimeterinstitute.ca/mp3/c1366441-8416-4fe2-a1a2-2b33b02ceacf.mp3 Science http://streamer.perimeterinstitute.ca/mp3/c1366441-8416-4fe2-a1a2-2b33b02ceacf.mp3 Tue, 02 May 2006 14:00:33 -0400 Andi Brandhuber http://streamer.perimeterinstitute.ca/mp3/f76152b2-ea7b-4720-bd13-b9f4ebe86bc3.mp3 Science http://streamer.perimeterinstitute.ca/mp3/f76152b2-ea7b-4720-bd13-b9f4ebe86bc3.mp3 Tue, 16 May 2006 14:00:29 -0400 Rutger Boels http://streamer.perimeterinstitute.ca/mp3/5b822f62-ef11-46ba-895f-79a79d6a7608.mp3 Science http://streamer.perimeterinstitute.ca/mp3/5b822f62-ef11-46ba-895f-79a79d6a7608.mp3 Tue, 23 May 2006 14:00:23 -0400 Hari Kunduri http://streamer.perimeterinstitute.ca/mp3/24e11c28-cb06-42a8-be2b-4517b01aaa38.mp3 Science http://streamer.perimeterinstitute.ca/mp3/24e11c28-cb06-42a8-be2b-4517b01aaa38.mp3 Mon, 05 Jun 2006 16:00:00 -0400 Geometric flows, especially the Ricci flow, have been used with considerable success in recent years to address the Poincare and Thurston conjectures for 3-manifolds. In this talk, I will briefly introduce these geometric flows, and describe how they appear in a completely different context in the physics of string theory. I will then outline how recently developed techniques in geometric flows could be used to address questions of importance in string theory. Suneeta Vardarajan http://streamer.perimeterinstitute.ca/mp3/0f69b536-c48c-4485-ae51-8cecb28e9009.mp3 Science http://streamer.perimeterinstitute.ca/mp3/0f69b536-c48c-4485-ae51-8cecb28e9009.mp3 Tue, 13 Jun 2006 14:00:24 -0400 Urjit Yajnik http://streamer.perimeterinstitute.ca/mp3/844aef13-1b07-49a8-a520-230c4dbfdb93.mp3 Science http://streamer.perimeterinstitute.ca/mp3/844aef13-1b07-49a8-a520-230c4dbfdb93.mp3 Tue, 20 Jun 2006 14:00:32 -0400 Shamanthi Fernando http://streamer.perimeterinstitute.ca/mp3/f621b84c-73d1-4ec3-b373-8094380d2eab.mp3 Science http://streamer.perimeterinstitute.ca/mp3/f621b84c-73d1-4ec3-b373-8094380d2eab.mp3 Tue, 20 Jun 2006 16:00:31 -0400 Studies of ${cal N}=4$ super Yang Mills operators with large R-charge have shown that, in the planar limit, the problem of computing their dimensions can be viewed as a certain spin chain. These spin chains have fundamental ``magnon'' excitations which obey a dispersion relation that is periodic in the momentum of the magnons. This result for the dispersion relation was also shown to hold at arbitrary 't Hooft coupling. Here we identify these magnons on the string theory side and we show how to reconcile a periodic dispersion relation with the continuum worldsheet description. The crucial idea is that the momentum is interpreted in the string theory side as a certain geometrical angle. We use these results to compute the energy of a spinning string. We also show that the symmetries that determine the dispersion relation and that constrain the S-matrix are the same in the gauge theory and the string theory. We compute the overall S-matrix at large 't Hooft coupling using the string description and we find that it agrees with an earlier conjecture. We also find an infinite number of two magnon bound states at strong coupling, while at weak coupling this number is finite. Diego Hofman http://streamer.perimeterinstitute.ca/mp3/48330c09-6f79-4350-99ce-d1b377fd9ffb.mp3 Science http://streamer.perimeterinstitute.ca/mp3/48330c09-6f79-4350-99ce-d1b377fd9ffb.mp3 Tue, 12 Sep 2006 11:00:00 -0400 Xi Yin http://streamer.perimeterinstitute.ca/mp3/d88d30dc-d0f4-4a00-b07d-023ff593a274.mp3 Science http://streamer.perimeterinstitute.ca/mp3/d88d30dc-d0f4-4a00-b07d-023ff593a274.mp3 Tue, 19 Sep 2006 16:00:00 -0400 Troels Harmark http://streamer.perimeterinstitute.ca/mp3/0bfe51d3-e858-470b-86bd-82715c5ce1e2.mp3 Science http://streamer.perimeterinstitute.ca/mp3/0bfe51d3-e858-470b-86bd-82715c5ce1e2.mp3 Tue, 26 Sep 2006 02:00:00 -0400 Kentaro Hori http://streamer.perimeterinstitute.ca/mp3/31efbc49-4bd4-437f-8579-d57e8a7f6cab.mp3 Science http://streamer.perimeterinstitute.ca/mp3/31efbc49-4bd4-437f-8579-d57e8a7f6cab.mp3 Thu, 05 Oct 2006 11:00:00 -0400 TBA Donovan Young http://streamer.perimeterinstitute.ca/mp3/2b49c106-bfef-4101-9780-cd37e735ab02.mp3 Science http://streamer.perimeterinstitute.ca/mp3/2b49c106-bfef-4101-9780-cd37e735ab02.mp3 Tue, 10 Oct 2006 11:00:00 -0400 Masaki Shigemori http://streamer.perimeterinstitute.ca/mp3/41fbdab5-35bb-4e26-b66a-4148d069f2a0.mp3 Science http://streamer.perimeterinstitute.ca/mp3/41fbdab5-35bb-4e26-b66a-4148d069f2a0.mp3 Tue, 17 Oct 2006 14:00:00 -0400 TBA Joe Conlon http://streamer.perimeterinstitute.ca/mp3/4e071773-2a7c-4caf-aa9f-33c49cbaf4db.mp3 Science http://streamer.perimeterinstitute.ca/mp3/4e071773-2a7c-4caf-aa9f-33c49cbaf4db.mp3 Thu, 19 Oct 2006 11:00:00 -0400 TBA Daniel Baumann http://streamer.perimeterinstitute.ca/mp3/b5c83023-be26-4e84-9fcb-895bed27b8b7.mp3 Science http://streamer.perimeterinstitute.ca/mp3/b5c83023-be26-4e84-9fcb-895bed27b8b7.mp3 Thu, 19 Oct 2006 14:00:00 -0400 Francesco Nitti http://streamer.perimeterinstitute.ca/mp3/32105cc7-30f2-49ab-bc49-2615e95897a1.mp3 Science http://streamer.perimeterinstitute.ca/mp3/32105cc7-30f2-49ab-bc49-2615e95897a1.mp3 Tue, 07 Nov 2006 11:00:00 -0500 TBA Pavel Kovtun http://streamer.perimeterinstitute.ca/mp3/e6546e0b-122f-45db-8006-b745a2ef35df.mp3 Science http://streamer.perimeterinstitute.ca/mp3/e6546e0b-122f-45db-8006-b745a2ef35df.mp3 Tue, 14 Nov 2006 11:00:00 -0500 I will discuss some ambiguities involved in using the AdS/CFT correspondence to calculate the ultra-relativistic jet quenching parameter for quarks moving in an N=4 super Yang-Mills thermal bath. Along the way, I will investigate the behavior of various string configurations on a five-dimensional AdS black hole background. Justin Vazquez-Poritz http://streamer.perimeterinstitute.ca/mp3/6a011117-dde6-4f37-8f48-44f5c2f2a04b.mp3 Science http://streamer.perimeterinstitute.ca/mp3/6a011117-dde6-4f37-8f48-44f5c2f2a04b.mp3 Tue, 21 Nov 2006 11:00:00 -0500 TBA James Sparks http://streamer.perimeterinstitute.ca/mp3/e1e79c14-d802-47cc-9194-40c28be8034f.mp3 Science http://streamer.perimeterinstitute.ca/mp3/e1e79c14-d802-47cc-9194-40c28be8034f.mp3 Tue, 28 Nov 2006 11:00:00 -0500 TBA Hong Liu http://streamer.perimeterinstitute.ca/mp3/969517f9-4906-4233-9278-69b743e66b60.mp3 Science http://streamer.perimeterinstitute.ca/mp3/969517f9-4906-4233-9278-69b743e66b60.mp3 Tue, 30 Jan 2007 14:00:00 -0500 The duality between theories of quantum strings and Yang-Mills gauge theories, in particular the AdS/CFT conjecture, has over the years given rise to many important physical insights. Recently, the realization that both sides of the duality, in certain limits, can be be described by integrable systems has lead to a good deal of progress. In this talk we will review the construction of these integrable structures and their usefulness in understanding strings in curved backgrounds/strongly coupled gauge theories. We will discuss how the asymptotic S-matrix that enters the Bethe equations for gauge theory anomalous dimensions provides a very convenient description of the system and how it can be reproduced from the classical string theory. Further, we will outline some partial attempts to extend this equivalence, and the corresponding integrable structures, to include world-sheet quantum loop effects. Tristan McLoughlin http://streamer.perimeterinstitute.ca/mp3/99bd3bce-53b9-4985-8e6e-167c1e027989.mp3 Science http://streamer.perimeterinstitute.ca/mp3/99bd3bce-53b9-4985-8e6e-167c1e027989.mp3 Tue, 06 Feb 2007 14:00:00 -0500 Nima Arkani-Hamed http://streamer.perimeterinstitute.ca/mp3/6359822a-9ac7-4728-abee-d290797c6d95.mp3 Science http://streamer.perimeterinstitute.ca/mp3/6359822a-9ac7-4728-abee-d290797c6d95.mp3 Thu, 08 Feb 2007 11:00:00 -0500 Light-cone superstring field theory (LCSFT) and matrix string theory (MST) are closely related. Both theories at the tree level are the Green-Schwarz superstring theory in the light-cone gauge. At the interaction level, the twist fields and the spin fields in MST correspond to the string interaction vertices in LCSFT. Since the CFT fields in MST are characterized by their OPEs, we would like to realize the OPEs by the interaction vertices in LCSFT to see the correspondence. In this talk I will begin with reviews of both theories and proceed to the correspondence between them. Sanefumi Moriyama http://streamer.perimeterinstitute.ca/mp3/3c22e622-f13b-41e7-8eb0-aaf14d934e9c.mp3 Science http://streamer.perimeterinstitute.ca/mp3/3c22e622-f13b-41e7-8eb0-aaf14d934e9c.mp3 Tue, 13 Feb 2007 14:00:00 -0500 After reviewing recent developments in the study of the AdS/CFT correspondence between the IR gauge theory living on a stack of D3-branes placed at a Calabi-Yau singularity and type IIB string theory on the near horizon geometry, we focus on the problem of counting chiral BPS operators in this class of CFTs and we match them with the dual string states in the general case of toric CY. Partition functions can be explicitly written in all sectors with fixed baryonic charge using localization over fixed points of the toric actions. These partition functions are related to the volume functions of the Sasaki-Einstein manifold and of its divisors. Agostino Butti http://streamer.perimeterinstitute.ca/mp3/cc3f6bc2-91f8-47a8-b022-6624f3c53dbd.mp3 Science http://streamer.perimeterinstitute.ca/mp3/cc3f6bc2-91f8-47a8-b022-6624f3c53dbd.mp3 Tue, 27 Feb 2007 14:00:00 -0500 We discuss D-brane instantons in four-dimensional string compactifications with special emphasis on Eucliden D2-branes in Type IIA orientifolds with spacetime filling D6-branes. These can induce superpotential couplings among the open string fields which are forbidden at the perturbative level since they violate some of the global U(1) symmetries generically present in string theory. Phenomenologcially important couplings of this type include Majorana mass terms for right-handed neutrinos or mu-terms in the Higss sector of the MSSM. If realized in concrete constructions, the exponential suppression of such non-perturbative terms may 'naturally' generate the observed hierarchies characteristic of these couplings. After discussing the general philosophy, we derive the prescription for the CFT computation of such non-perturbative superpotential couplings and exemplify the computation of Majorana mass terms in toroidal intersecting brane worlds. If time permits, we also comment on D2-instanton effetcs potentially destabilising the vacuum or modifying the D-term supersymmetry conditions. Timo Weigand http://streamer.perimeterinstitute.ca/mp3/1f8cb2c3-2788-4497-acff-3e01e23a5416.mp3 Science http://streamer.perimeterinstitute.ca/mp3/1f8cb2c3-2788-4497-acff-3e01e23a5416.mp3 Tue, 06 Mar 2007 14:00:00 -0500 To realize massive pions, I propose a variation of the holographic model of massless QCD using the D4/D8/D8bar-brane configuration proposed by Sakai and Sugimoto. The deformation breaks the chiral symmetry explicitly and I compute the mass of the pions and vector mesons. The observed value of the pion mass can be obtained. I also argue a chiral perturbation corresponding to the deformation. Koji Hashimoto http://streamer.perimeterinstitute.ca/mp3/344b16bd-8f57-40d8-978a-441f4bda539f.mp3 Science http://streamer.perimeterinstitute.ca/mp3/344b16bd-8f57-40d8-978a-441f4bda539f.mp3 Tue, 20 Mar 2007 14:00:00 -0400 tba Gautam Mandal http://streamer.perimeterinstitute.ca/mp3/f350bbfc-2607-4f96-8266-3dd6bb850454.mp3 Science http://streamer.perimeterinstitute.ca/mp3/f350bbfc-2607-4f96-8266-3dd6bb850454.mp3 Tue, 03 Apr 2007 14:00:00 -0400 TBA Peng Gao http://streamer.perimeterinstitute.ca/mp3/a0890f8e-0818-436a-81e4-47332c840c57.mp3 Science http://streamer.perimeterinstitute.ca/mp3/a0890f8e-0818-436a-81e4-47332c840c57.mp3 Tue, 10 Apr 2007 14:00:00 -0400 TBA Anatoly Dymarsky http://streamer.perimeterinstitute.ca/mp3/c6d0fde6-b7a1-4f88-9d0a-54ab5a299722.mp3 Science http://streamer.perimeterinstitute.ca/mp3/c6d0fde6-b7a1-4f88-9d0a-54ab5a299722.mp3 Tue, 17 Apr 2007 14:00:00 -0400 TBA Andrei Parnachev http://streamer.perimeterinstitute.ca/mp3/6ceb91b0-6fbc-4ca1-b659-eb4ba4e8caf9.mp3 Science http://streamer.perimeterinstitute.ca/mp3/6ceb91b0-6fbc-4ca1-b659-eb4ba4e8caf9.mp3 Tue, 24 Apr 2007 14:00:00 -0400 TBA Martijn Wijnholt http://streamer.perimeterinstitute.ca/mp3/dc9c0e8f-e085-4b1a-8122-9e5a9183c37a.mp3 Science http://streamer.perimeterinstitute.ca/mp3/dc9c0e8f-e085-4b1a-8122-9e5a9183c37a.mp3 Tue, 08 May 2007 14:00:00 -0400 TBA Sean Hartnoll http://streamer.perimeterinstitute.ca/mp3/eaf8b447-729e-4f52-b99a-b95626b18278.mp3 Science http://streamer.perimeterinstitute.ca/mp3/eaf8b447-729e-4f52-b99a-b95626b18278.mp3 Wed, 16 May 2007 11:00:00 -0400 I will discuss a solution generating technique that allows to generate stationary axisymmetric solutions of five-dimensional gravity, starting from static ones. This technique can be used to add angular momentum to static configurations. It can also be used to add KK-monopole charge to asymptotically flat five-dimensional solutions, thus generating geometries that interpolate between five-dimensional and four-dimensional solutions. Stefano Giusto http://streamer.perimeterinstitute.ca/mp3/c1449c25-30b6-46e4-91aa-0b1bfa28c10c.mp3 Science http://streamer.perimeterinstitute.ca/mp3/c1449c25-30b6-46e4-91aa-0b1bfa28c10c.mp3 Tue, 18 Sep 2007 11:00:00 -0400 I'll discuss a reformulation of twistor-string theory as a heterotic string. This clarifies why conformal supergravity arises and provides a link between the Berkovits and Witten pictures. The talk is based on arXiv:0708:2276 with Lionel Mason. David Skinner http://streamer.perimeterinstitute.ca/mp3/19f2ac51-066e-4b70-bb57-12bb87737764.mp3 Science http://streamer.perimeterinstitute.ca/mp3/19f2ac51-066e-4b70-bb57-12bb87737764.mp3 Tue, 25 Sep 2007 11:00:00 -0400 It has been known for a long time that instanton effects control the large order behavior of the perturbation series in quantum mechanics and gauge theories. I present a study of this connection in the context of matrix models in 1/N-expansion and topological strings. I will show how to compute the one-instanton corrections for a generic matrix model. Due to a recent matrix model inspired formalism for the topological string amplitudes on local Calabi-Yau manifolds, this can be used to compute nonperturbative effects in topological string theory and make predictions about the asymptotics of the string perturbation series. I discuss various cases where our predictions can be tested, yielding spectacular agreement with the asymptotics extracted by standard numerical methods. Marlene Weiss http://streamer.perimeterinstitute.ca/mp3/447a5365-8dee-4dfa-9fcb-06511499ad02.mp3 Science http://streamer.perimeterinstitute.ca/mp3/447a5365-8dee-4dfa-9fcb-06511499ad02.mp3 Tue, 16 Oct 2007 11:00:00 -0400 Resent research seems to indicate that charged extremal black holes in D=4 supersymmetric theories should be most naturally described in terms of more primitive atomic constituents. I will briefly describe what I mean by these atomic constituents and how they appear to play a role in both BPS and non-BPS extremal black holes. Eric Gimon http://streamer.perimeterinstitute.ca/mp3/55b9693b-5353-479e-9ad9-84fb78a21606.mp3 Science http://streamer.perimeterinstitute.ca/mp3/55b9693b-5353-479e-9ad9-84fb78a21606.mp3 Tue, 23 Oct 2007 11:00:00 -0400 We present a general hydrodynamic theory of transport in the vicinity of superfluid-insulator transitions in two spatial dimensions described by ``Lorentz''-invariant quantum critical points. We allow for a weak impurity scattering rate, a magnetic field $B$, and a deviation in the density, $rho$, from that of the insulator. We show that the frequency-dependent thermal and electric linear response functions, including the Nernst coefficient, are fully determined by a single transport coefficient (a universal electrical conductivity), the impurity scattering rate, and a few thermodynamic state variables. With reasonable estimates for the parameters, our results predict a magnetic field and temperature dependence of the Nernst signal which resembles measurements in the cuprates, including the overall magnitude. Our theory predicts a ``hydrodynamic cyclotron mode'' which could be observable in ultrapure samples. We also present exact results for the zero frequency transport co-efficients of a supersymmetric conformal field theory (CFT), which is solvable by the AdS/CFT correspondence. This correspondence maps the $rho$ and $B$ perturbations of the 2+1 dimensional CFT to electric and magnetic charges of a black hole in the 3+1 dimensional anti-de Sitter space. These exact results are found to be in full agreement with the general predictions of our hydrodynamic analysis in the appropriate limiting regime. The mapping of the hydrodynamic and AdS/CFT results under particle-vortex duality is also described. Markus Mueller http://streamer.perimeterinstitute.ca/mp3/0ca2a5a3-41cf-4db6-bcb8-2286db5e3cf7.mp3 Science http://streamer.perimeterinstitute.ca/mp3/0ca2a5a3-41cf-4db6-bcb8-2286db5e3cf7.mp3 Tue, 23 Oct 2007 16:00:00 -0400 I will present a construction of supersymmetric Wilson loop operators in N=4 SYM for an arbitrary path on an S3 subspace of space-time. I will show how they are evaluated in AdS and in particular that the string world-sheet is a generalized calibration with respect to an almost-complex structure associate to the supersymmetries preserved by the loop. I will present some special examples and in the case when the loop is restricted to an S2, some evidence that the calculation reduces to a perturbative calculation in YM in 2-dimensions on S2. This in turn is exactly soluble in terms of a 0-dimensional matrix model. Nadvo Drukker http://streamer.perimeterinstitute.ca/mp3/aba51ead-4040-41b8-9810-a215f0a38a5b.mp3 Science http://streamer.perimeterinstitute.ca/mp3/aba51ead-4040-41b8-9810-a215f0a38a5b.mp3 Tue, 30 Oct 2007 11:00:00 -0400 TBA Andy Strominger http://streamer.perimeterinstitute.ca/mp3/f9ca55f0-0982-449c-af92-f8846a9104cb.mp3 Science http://streamer.perimeterinstitute.ca/mp3/f9ca55f0-0982-449c-af92-f8846a9104cb.mp3 Mon, 12 Nov 2007 11:00:00 -0500 TBA Laurent Freidel http://streamer.perimeterinstitute.ca/mp3/e9488850-4f84-47b5-a646-cd690be12040.mp3 Science http://streamer.perimeterinstitute.ca/mp3/e9488850-4f84-47b5-a646-cd690be12040.mp3 Tue, 13 Nov 2007 11:00:00 -0500 We describe simple systems where stringy instantons induce dynamical supersymmetry breaking, without any non-Abelian gauge dynamics. In suitable cases, a dual description via geometric transitions allows one to recast the instanton-generated superpotential as a classical flux superpotential. These simple DSB systems may have applications in model building. Shamit Kachru http://streamer.perimeterinstitute.ca/mp3/36ea9394-9134-4681-9d29-2041add37569.mp3 Science http://streamer.perimeterinstitute.ca/mp3/36ea9394-9134-4681-9d29-2041add37569.mp3 Tue, 20 Nov 2007 11:00:00 -0500 TBA Sebastian Franco http://streamer.perimeterinstitute.ca/mp3/d769c104-6575-4f7e-bd5d-82f7c2105a0c.mp3 Science http://streamer.perimeterinstitute.ca/mp3/d769c104-6575-4f7e-bd5d-82f7c2105a0c.mp3 Mon, 26 Nov 2007 11:00:00 -0500 I will describe the emergence of geometric (Berry) phases in supersymmetric systems. In theories with degenerate states, non-Abelian geometric phases can arise. I show how supersymmetry helps to ensure the existence of this phenomenon by invoking the examples of systems with (2,2) and (4,4) supersymmetry. In the former, I show how instantons contribute crucially to the form of the non-Abelian phase. The latter system applies to D0-D4 brane dynamics in string theory, leading to a surprising re-interpretation of the Berry phase in terms of gravitational precession of a probe brane. Towards the end will comment on some work in progress on the geometric phase in (8,8) SUSY systems. Julian Sonner http://streamer.perimeterinstitute.ca/mp3/7a5baaf7-3bbe-4ad2-9743-007b3fd81390.mp3 Science http://streamer.perimeterinstitute.ca/mp3/7a5baaf7-3bbe-4ad2-9743-007b3fd81390.mp3 Tue, 11 Dec 2007 11:00:00 -0500 TBA Mark Van Raamsdonk http://streamer.perimeterinstitute.ca/mp3/fa3ffe45-a571-430c-9bf6-66955814b7b4.mp3 Science http://streamer.perimeterinstitute.ca/mp3/fa3ffe45-a571-430c-9bf6-66955814b7b4.mp3 Tue, 15 Jan 2008 11:00:00 -0500 TBA Philip Argyres http://streamer.perimeterinstitute.ca/mp3/1129c76d-0457-4cc1-bf12-8ebe6aec3afa.mp3 Science http://streamer.perimeterinstitute.ca/mp3/1129c76d-0457-4cc1-bf12-8ebe6aec3afa.mp3 Tue, 22 Jan 2008 11:00:00 -0500 TBA Andrei Starinets http://streamer.perimeterinstitute.ca/mp3/174e0931-5a34-4fbd-bbd3-23a76e637e9f.mp3 Science http://streamer.perimeterinstitute.ca/mp3/174e0931-5a34-4fbd-bbd3-23a76e637e9f.mp3 Tue, 29 Jan 2008 11:00:00 -0500 TBA David Kutasov http://streamer.perimeterinstitute.ca/mp3/623138f8-7726-4fcf-bf7c-9325f5bc4123.mp3 Science http://streamer.perimeterinstitute.ca/mp3/623138f8-7726-4fcf-bf7c-9325f5bc4123.mp3 Tue, 05 Feb 2008 14:00:00 -0500 TBA Borun Chowdhury http://streamer.perimeterinstitute.ca/mp3/4525a324-d437-4abb-b7f9-3a3d3982e7d2.mp3 Science http://streamer.perimeterinstitute.ca/mp3/4525a324-d437-4abb-b7f9-3a3d3982e7d2.mp3 Tue, 12 Feb 2008 11:00:00 -0500 We consider the large N limit of a class of fourdimensional supersymmetric theories in conjunction with a limit in their parameter space towards singular points where extra baryonic states become light, which causes the low-energy description to break down. However, this can be cured by defining a large N double scaling limit where one approaches the singularity by keeping the mass M of these states fixed. This limit has several interesting features. For example, the conventional \'t Hooft limit leads to a free theory of colour singlet states where all interactions are suppressed by powers of 1/N. In this case, the large N Hilbert space splits into two decoupled sectors, and one of them keeps residual interactions whose strength in inversely proportional to the mass M. We argue that for a class of these models the dynamics of this sector is dual to a non-critical superstring background, which is exactly solvable. Gaetano Bertoldi http://streamer.perimeterinstitute.ca/mp3/270b9579-a27e-437c-b66b-6c15070098eb.mp3 Science http://streamer.perimeterinstitute.ca/mp3/270b9579-a27e-437c-b66b-6c15070098eb.mp3 Tue, 19 Feb 2008 11:00:00 -0500 TBA Lance Dixon http://streamer.perimeterinstitute.ca/mp3/12457893-bf93-477d-a86c-bba1259cc2a5.mp3 Science http://streamer.perimeterinstitute.ca/mp3/12457893-bf93-477d-a86c-bba1259cc2a5.mp3 Tue, 26 Feb 2008 11:00:00 -0500 TBA Daniel Baumann http://streamer.perimeterinstitute.ca/mp3/e3e7da37-7adb-4fbb-9d51-d5f6b089685c.mp3 Science http://streamer.perimeterinstitute.ca/mp3/e3e7da37-7adb-4fbb-9d51-d5f6b089685c.mp3 Tue, 04 Mar 2008 11:00:00 -0500 TBA Keshav Dasgupta http://streamer.perimeterinstitute.ca/mp3/567ccbc1-0e7c-4786-a672-f57735b7be0c.mp3 Science http://streamer.perimeterinstitute.ca/mp3/567ccbc1-0e7c-4786-a672-f57735b7be0c.mp3 Tue, 11 Mar 2008 11:00:00 -0400 Robert Myers http://streamer.perimeterinstitute.ca/mp3/c4bc5a04-82a1-4a89-b119-7dfc378d2535.mp3 Science http://streamer.perimeterinstitute.ca/mp3/c4bc5a04-82a1-4a89-b119-7dfc378d2535.mp3 Tue, 18 Mar 2008 11:00:00 -0400 Evgeny Buchbinder http://streamer.perimeterinstitute.ca/mp3/84dbd3fe-3136-4385-b721-e1938dbafbf5.mp3 Science http://streamer.perimeterinstitute.ca/mp3/84dbd3fe-3136-4385-b721-e1938dbafbf5.mp3 Tue, 25 Mar 2008 11:00:00 -0400 TBA Ben Freivogel http://streamer.perimeterinstitute.ca/mp3/74d7a48f-3a1b-482a-b107-3a869dfb6a2a.mp3 Science http://streamer.perimeterinstitute.ca/mp3/74d7a48f-3a1b-482a-b107-3a869dfb6a2a.mp3 Mon, 31 Mar 2008 11:00:00 -0400 TBA Joe Polchinski http://streamer.perimeterinstitute.ca/mp3/a0cbf2e7-bd2a-4a39-b163-87e0222c952e.mp3 Science http://streamer.perimeterinstitute.ca/mp3/a0cbf2e7-bd2a-4a39-b163-87e0222c952e.mp3 Thu, 10 Apr 2008 11:00:00 -0400 F-theory compactifications on Calabi-Yau fourfolds provide one way to obtain N=1 supersymmetric grand unified models of particle physics from string theory. With this motivation in mind, I will consider F-theory on a particularly simple class of local Calabi-Yau fourfolds, for which a low-energy analysis based upon topological gauge theory is valid. For these models, I will explain how the geometry of the fourfold determines the spectrum of massless charged matter and the effective superpotential in four dimensions. If time permits, I will also discuss the relation between certain surface operators in gauge theory and brane recombination in F-theory. Chris Beasley http://streamer.perimeterinstitute.ca/mp3/744a47ad-679e-4cbe-89f4-d9f6527ced2f.mp3 Science http://streamer.perimeterinstitute.ca/mp3/744a47ad-679e-4cbe-89f4-d9f6527ced2f.mp3 Tue, 15 Apr 2008 11:00:00 -0400 Geometries produced by brane intersections preserving eight supercharges are constructed. Typical examples of such configurations are given by fundamental strings ending on D branes and by brane webs. Consistency conditions of supergravity are shown to impose certain requirements on the locations of the sources, and these restrictions are found to be in a perfect agreement with results of the probe analysis. This agreement serves as a nontrivial test of the duality between open and closed strings. Some applications to AdS/CFT correspondence are also discussed. Oleg Lunin http://streamer.perimeterinstitute.ca/mp3/6544cd08-6870-46fa-a258-a7f50980045c.mp3 Science http://streamer.perimeterinstitute.ca/mp3/6544cd08-6870-46fa-a258-a7f50980045c.mp3 Tue, 22 Apr 2008 11:00:00 -0400 TBA Vasily Pestun http://streamer.perimeterinstitute.ca/mp3/984d2f42-881b-4690-be3f-1d1599933fe7.mp3 Science http://streamer.perimeterinstitute.ca/mp3/984d2f42-881b-4690-be3f-1d1599933fe7.mp3 Tue, 29 Apr 2008 11:00:00 -0400 TBA Donald Marolf http://streamer.perimeterinstitute.ca/mp3/6e6a449e-6973-406f-b4cc-652d6f160415.mp3 Science http://streamer.perimeterinstitute.ca/mp3/6e6a449e-6973-406f-b4cc-652d6f160415.mp3 Tue, 06 May 2008 11:00:00 -0400 The rich network of string dualities provides powerful constraints in the structure of the theory. The connection of ten-dimensional type II theories to eleven-dimensional supergravity compactified on a circle and on a torus allows one to compute many perturbative high genus terms as well as the complete sum of non-perturbative contributions to a given higher derivative coupling of the string effective action. The same duality connection leads to a series of surprising non-renormalization theorems. These control the UV behavior of maximal supergravity in lower dimensions, and indicate that N=8 supergravity in four dimensions might be a finite quantum gravity theory. Jorge Russo http://streamer.perimeterinstitute.ca/mp3/f551cce0-9f4a-4c4b-9118-32b6f1ed7b52.mp3 Science http://streamer.perimeterinstitute.ca/mp3/f551cce0-9f4a-4c4b-9118-32b6f1ed7b52.mp3 Tue, 13 May 2008 11:00:00 -0400 TBA Jeffrey Harvey http://streamer.perimeterinstitute.ca/mp3/d7a9e81e-c00d-43ef-9a19-424ec54a69fb.mp3 Science http://streamer.perimeterinstitute.ca/mp3/d7a9e81e-c00d-43ef-9a19-424ec54a69fb.mp3 Tue, 20 May 2008 11:00:00 -0400 We discuss recent developments in the study of black holes and similar compact objects in string theory. The focus is on how these solutions are effected by higher-derivative terms in an effective action. The setting of this investigation is an off-shell formulation of five-dimensional supergravity, including terms of order four-derivatives whose precise form are determined by embedding this theory in M-theory. We find that certain singular solutions are fully regularized by the higher-derivative terms and that generic solutions receive calculable corrections to the entropy, or other relevant quantities such as the dual central charge. A particular solution studied corresponds to the geometry sourced by a fundamental string and may set the stage for a new and exciting example of holography. Joshua Davis http://streamer.perimeterinstitute.ca/mp3/b23140bd-8ab1-4324-9c4a-3e1a43709179.mp3 Science http://streamer.perimeterinstitute.ca/mp3/b23140bd-8ab1-4324-9c4a-3e1a43709179.mp3 Tue, 10 Jun 2008 11:00:00 -0400 I will report on some work in progress with Dan Freed and Greg Moore. In an orientifold background, D-brane charge takes values in a certain twisted version of KR Theory. Moreover, there is a nontrivial background charge ('tadpole'). Up 'til now, this background charge has only been calculated rationally -- i.e., ignoring torsion. We derive a formula for it, over the integers. Only after 'inverting 2', does the charge localize to the fixed point sets of the orientifold action, and we can give a compact formula for it. This reproduces the previously known rational results, but contains new information. Jacques Distler http://streamer.perimeterinstitute.ca/mp3/731c5f3a-928f-453a-b569-db5c574d2a6c.mp3 Science http://streamer.perimeterinstitute.ca/mp3/731c5f3a-928f-453a-b569-db5c574d2a6c.mp3 Tue, 09 Sep 2008 11:00:00 -0400 We will discuss the missing pieces in the understanding of the effective field theory description of string creation, the T-dual of the Hanany-Witten effect, both in the open and closed string picture. We explain the origin of the 'bare' Chern-Simons term, so far added in by hand. There however remain unsettled issues concerning the need to modify the DBI action and the interpretation of this term in M-theory. Janet Hung http://streamer.perimeterinstitute.ca/mp3/3ef9f19a-7e4a-4427-8251-88d1a4dc6ca1.mp3 Science http://streamer.perimeterinstitute.ca/mp3/3ef9f19a-7e4a-4427-8251-88d1a4dc6ca1.mp3 Tue, 16 Sep 2008 14:00:00 -0400 TBA Ben Freivogel http://streamer.perimeterinstitute.ca/mp3/63b76fc0-2d9e-4214-8279-7ba8549d27f9.mp3 Science http://streamer.perimeterinstitute.ca/mp3/63b76fc0-2d9e-4214-8279-7ba8549d27f9.mp3 Tue, 07 Oct 2008 11:00:00 -0400 We review basic properties of effective worldvolume theory describing the dynamics of Dirichlet branes in type II supergravity backgrounds and then show that the SL(2,R) symmetry of IIB supergravity allows for the existence of new supersymmetric 7-brane configurations called Q7-branes. The Q7-branes differ from the D7-branes, in particular, by their coupling to the dilaton, axion and to `magnetic' gauge field duals thereof. The appearance of Q7-branes and their instanton duals may indicate the existence of a new, yet unexplored, perturbative vacuum of type IIB string theory. Dmitri Sorokin http://streamer.perimeterinstitute.ca/mp3/ac11d5ce-e56e-4cd0-8e9f-8fed6535a771.mp3 Science http://streamer.perimeterinstitute.ca/mp3/ac11d5ce-e56e-4cd0-8e9f-8fed6535a771.mp3 Tue, 14 Oct 2008 11:00:00 -0400 The discovery of integrability in the large N limit of the prototypical realization of the AdS/CFT correspondence has raised the hope that the spectrum of scale dimensions in N=4 SYM (and strings in AdS_5 x S^5) might be known exactly, i.e. to all orders in the coupling constant. So far, most of the efforts focused on closed strings and periodic boundary conditions. In this talk I will discuss how these ideas are extended to open string and open boundary conditions. In particular how to obtain exact expressions for the boundary scattering matrices, discuss the integrability of the boundary conditions and how finite size effects may be taken into account. Diego Correa http://streamer.perimeterinstitute.ca/mp3/54aa48c4-450f-40f1-a7e9-bae806c29123.mp3 Science http://streamer.perimeterinstitute.ca/mp3/54aa48c4-450f-40f1-a7e9-bae806c29123.mp3 Tue, 21 Oct 2008 11:00:00 -0400 TBA Igor Klebanov http://streamer.perimeterinstitute.ca/mp3/3f74a483-adc8-4d6d-881f-2132550efcd0.mp3 Science http://streamer.perimeterinstitute.ca/mp3/3f74a483-adc8-4d6d-881f-2132550efcd0.mp3 Tue, 28 Oct 2008 11:00:00 -0400 TBA Joseph Marsano http://streamer.perimeterinstitute.ca/mp3/46bdca9f-7377-45a7-b27e-995de408008d.mp3 Science http://streamer.perimeterinstitute.ca/mp3/46bdca9f-7377-45a7-b27e-995de408008d.mp3 Tue, 04 Nov 2008 11:00:00 -0500 TBA Rob Leigh http://streamer.perimeterinstitute.ca/mp3/6eb9e1c2-526a-4cf2-8313-f602687c9a27.mp3 Science http://streamer.perimeterinstitute.ca/mp3/6eb9e1c2-526a-4cf2-8313-f602687c9a27.mp3 Thu, 06 Nov 2008 16:00:00 -0500 TBA Dan Freedman http://streamer.perimeterinstitute.ca/mp3/a3bcc4fc-d217-4d4e-95cc-9a622f31de11.mp3 Science http://streamer.perimeterinstitute.ca/mp3/a3bcc4fc-d217-4d4e-95cc-9a622f31de11.mp3 Tue, 11 Nov 2008 11:00:00 -0500 We discuss holography for geometries that are asymptotic to non-conformal brane backgrounds. The near-horizon limit of all non-conformal branes, including D-branes and the fundamental string but excluding five-branes, is conformal to $AdS_{p+2} imes S^{8-p}$ with a linear dilaton. They exhibit a generalized conformal structure, both on the QFT and on the gravitational side. We develop holographic renormalization for all these cases and discuss a number of applications. We compute the holographic 2-point functions of the stress energy tensor and gluon operator and show they satisfy the expected Ward identities and the constraints of generalized conformal structure. The holographic results are also manifestly compatible with the M-theory uplift, with the asymptotic solutions, counterterms, one and two point functions etc. of the IIA F1 and D4 appropriately descending from those of M2 and M5 branes, respectively. Kostas Skenderis http://streamer.perimeterinstitute.ca/mp3/b8d938a2-071c-4900-ab6e-3b8975a15dc8.mp3 Science http://streamer.perimeterinstitute.ca/mp3/b8d938a2-071c-4900-ab6e-3b8975a15dc8.mp3 Tue, 18 Nov 2008 11:00:00 -0500 We discuss various properties of holographic mesons in a deconfined strongly coupled plasma. We show that such mesons obtain a width from a non-perturbative effect. On the string theory side this is due to open string modes on a D-brane tunneling into a black hole through worldsheet instantons. On the field theory side these instantons have the simple interpretation as heavy thermal quarks. We also comment on how this non-perturbative effect has important consequences for the phase structure of the Yang-Mills theory obtained in the classical gravity limit. Thomas Faulkner http://streamer.perimeterinstitute.ca/mp3/5f388906-a7d8-4a02-89d3-a5bae54cf72b.mp3 Science http://streamer.perimeterinstitute.ca/mp3/5f388906-a7d8-4a02-89d3-a5bae54cf72b.mp3 Tue, 25 Nov 2008 11:00:00 -0500 Understanding dynamics of strongly coupled quantum field theories is an important problem in both condensed matter physics and high energy physics. In condensed matter systems, interacting quantum field theories can arise either at a critical point, or in a finite region of a parameter space. In the former case, massless modes arise as a result of fine tuning of external parameters, while, in the latter case, massless modes are protected by topology and/or symmetry. In this talk, I will discuss two examples in 2+1 dimensions (one for each case) where one can understand strong coupling physics nonperturbatively. In the first example, a lattice model which describes a superconducting phase transition will be discussed. In this model, a superconformal symmetry dynamically emerges at the quantum critical point and one can predict non-trivial critical exponents using the enlarged symmetry, even though there is no underlying supersymmetry in the microscopic model. In the second example, I will discuss about a 2+1 dimensional non-relativistic quantum field theory which is dual to a gravitational theory in the AdS4 background with a charged black hole. The spectral function of a fermion field exhibits an interesting non-Fermi liquid behavior, that is, all momentum points inside the Fermi surface are critical and the gapless modes are defined in a critical Fermi ball in the momentum space. Sung-Sik Lee http://streamer.perimeterinstitute.ca/mp3/daa8c76f-b349-472c-b2c3-a23b307a2297.mp3 Science http://streamer.perimeterinstitute.ca/mp3/daa8c76f-b349-472c-b2c3-a23b307a2297.mp3 Wed, 03 Dec 2008 09:30:00 -0500 In this talk I discuss methods to determine hydrodynamical dispersion relations from an extra-dimensional gravity dual wherein the metric is supported by scalar fields. Such a setup may eventually be used as a model of the strongly coupled plasma created in heavy ion collisions. I examine examples of both the shear and sound modes. The shear mode is analyzed using the black hole membrane paradigm; a calculation of the shear viscosity is reviewed, and then the calculation is extended to the next hydrodynamical order. All results agree with those found using the AdS/CFT prescription. The sound mode is analyzed by examining the quasi-normal modes of the dual black hole. The relevant gauge invariant equations are derived, and a special case solution of these equations is discussed. Todd Springer http://streamer.perimeterinstitute.ca/mp3/639c6de5-1fe8-40f0-9981-e905ace5d9cf.mp3 Science http://streamer.perimeterinstitute.ca/mp3/639c6de5-1fe8-40f0-9981-e905ace5d9cf.mp3 Thu, 04 Dec 2008 12:30:00 -0500