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The Death Throes of Massive Stars: Supernovae, Black Holes, and Neutrinos

Evan O'Connor California Institute of Technology
April 09, 2013

PIRSA:13040120
Cosmology
12/13 PSI - Explorations in Cosmology Lecture 2

Matthew Johnson York University
April 09, 2013

PIRSA:13040063
Cosmology
Classical and quantum circuit obfuscation with braids

Stephen Jordan National Institute of Standards and Technology
April 08, 2013

PIRSA:13040111
Quantum Foundations
12/13 PSI - Explorations in String Theory Lecture 1

Pedro Vieira Perimeter Institute for Theoretical Physics
April 08, 2013

PIRSA:13040084
Quantum Fields and Strings
12/13 PSI - Explorations in Cosmology Lecture 1

Matthew Johnson York University
April 08, 2013

PIRSA:13040062
Cosmology
2D to 4D Correspondence: Towers of Kinks versus Towers of Monopoles
April 05, 2013

PIRSA:13040031
Quantum Fields and Strings
12/13 PSI - Explorations in Particle Theory Lecture 14

David Morrissey TRIUMF
April 05, 2013

PIRSA:13040042
Particle Physics
12/13 PSI - Explorations on Quantum Information Lecture 14

David Cory Institute for Quantum Computing (IQC)
April 05, 2013

PIRSA:13040037
Quantum Information
Advanced General Relativity - Lecture 22

Rafael Sorkin Perimeter Institute for Theoretical Physics

April 04, 2013

PIRSA:13040003
Fundamental Physics with Optically Levitated Dielectric Objects

Asimina Arvanitaki Perimeter Institute for Theoretical Physics
April 04, 2013

PIRSA:13040114
Strong Gravity
12/13 PSI - Explorations in Particle Theory Lecture 13

David Morrissey TRIUMF
April 04, 2013

PIRSA:13040041
Particle Physics
12/13 PSI - Explorations on Quantum Information Lecture 13

David Cory Institute for Quantum Computing (IQC)
April 04, 2013

PIRSA:13040036
Quantum Information

The Death Throes of Massive Stars: Supernovae, Black Holes, and Neutrinos

Evan O'Connor California Institute of Technology
April 09, 2013

PIRSA:13040120
Cosmology
The endgame of massive star evolution is the gravitational-induced collapse of the central inert iron core. The collapse of the core continues until the matter reaches nuclear densities where the strong force between nucleons becomes dominant and provides sufficient pressure to stabilize the newly formed protoneutron star. What ensues is a complex multi-physics problem involving strong gravity, multidimensional hydrodynamic instabilities, magnetic fields, multispecies neutrino radiation, and supranuclear density physics to name a few.

We expect that most massive stars end this final stage of stellar evolution with a successful core-collapse supernova explosion. However, we also know that some of these core collapse events must fail and form stellar mass black holes.In his talk I will touch on two of the most important questions in core-collapse supernovae theory. I will briefly talk about what conditions are favourable for failed core-collapse supernovae (i.e. black hole formation). Conversely, I will discuss recent results from full three-dimensional, general-relativistic simulations of core-collapse and the implications for our understanding of the core-collapse supernova mechanism. If time permits, I'll discuss how neutrinos from the next galactic core-collapse supernova can help constrain properties of massive stars.
12/13 PSI - Explorations in Cosmology Lecture 2

Matthew Johnson York University
April 09, 2013

PIRSA:13040063
Cosmology
Classical and quantum circuit obfuscation with braids

Stephen Jordan National Institute of Standards and Technology
April 08, 2013

PIRSA:13040111
Quantum Foundations
A circuit obfuscator is an algorithm that translates logic circuits into functionally-equivalent similarly-sized logic circuits that are hard to understand. While ad hoc obfuscators have been implemented, theoretical progress has mainly been limited to no-go results. In this work, we propose a new notion of circuit obfuscation, which we call partial indistinguishability. We then prove that, in contrast to previous definitions of obfuscation, partial indistinguishability obfuscation can be achieved by a polynomial-time algorithm. Specifically, our algorithm re-compiles the given circuit using a gate that satisfies the relations of the braid group, and then reduces to a braid normal form. Variants of our obfuscation algorithm can be applied to both classical and quantum circuits.
12/13 PSI - Explorations in String Theory Lecture 1

Pedro Vieira Perimeter Institute for Theoretical Physics
April 08, 2013

PIRSA:13040084
Quantum Fields and Strings
12/13 PSI - Explorations in Cosmology Lecture 1

Matthew Johnson York University
April 08, 2013

PIRSA:13040062
Cosmology
2D to 4D Correspondence: Towers of Kinks versus Towers of Monopoles
April 05, 2013

PIRSA:13040031
Quantum Fields and Strings
Two-dimensional models provide for a very attractive playground being a theory imitating some of the main features of QCD. Those include the asymptotic freedom, mass gap, confinement, chiral symmetry breaking and others. Furthermore, there is a correspondence between the spectra of four-dimensional SQCD and N=(2,2) CP(N-1) sigma model which was discovered more than a decade ago. This correspondence was explained later when it was found that SQCD supports non-Abelian strings with confined monopoles. The kinks of the two-dimensional theory are the monopoles attached to the strings. Thus, analysis of two-dimensional sigma models gives a deeper insight into the four-dimensional SQCD, in particular, into its strong dynamics.

We study the BPS spectrum of the N=(2,2) CP(N-1) model with the Z_N-symmetric twisted mass terms. We focus on analysis of the "extra'' towers of states found previously and compare them to the states that can be identified in the quasiclassical domain. Exact analysis of the strong-coupling states shows that not all of them survive when passing to the weak-coupling domain. Some of the states decay on the curves of the marginal stability (CMS). Thus, most of the strong coupling states do not exist at weak coupling and cannot be classified quasiclassically. This result lifts to four dimensions. In terms of the four-dimensional theory, the "extra" states are the strong coupling dyons, while the quasiclassical bound states are the bound states of dyons and quarks.
12/13 PSI - Explorations in Particle Theory Lecture 14

David Morrissey TRIUMF
April 05, 2013

PIRSA:13040042
Particle Physics
12/13 PSI - Explorations on Quantum Information Lecture 14

David Cory Institute for Quantum Computing (IQC)
April 05, 2013

PIRSA:13040037
Quantum Information
Advanced General Relativity - Lecture 22

Rafael Sorkin Perimeter Institute for Theoretical Physics

April 04, 2013

PIRSA:13040003
Fundamental Physics with Optically Levitated Dielectric Objects

Asimina Arvanitaki Perimeter Institute for Theoretical Physics
April 04, 2013

PIRSA:13040114
Strong Gravity
In the past few years, optical cooling and manipulating of macroscopic objects, such as micro-mirrors and cantilevers has developed into an active field of research. In mechanical systems, the oscillator is attached to its suspension, a thermal contact that limits the motion isolation. On the other hand, when these small objects are levitated using the radiation pressure force of lasers, the excellent thermal isolation even at room temperatures helps produce very sensitive force detectors, and eventually quantum transducers for quantum computation purposes. These new techniques may have a variety of applications for fundamental physics such as short distance tests of gravity and gravitational wave detection at high frequencies. In addition, there are several proposals suggesting that optically levitated dielectrics can be cooled to the ground state of the center of mass motion, opening the exciting possibility of creating macroscopic matter-wave interferometers.
12/13 PSI - Explorations in Particle Theory Lecture 13

David Morrissey TRIUMF
April 04, 2013

PIRSA:13040041
Particle Physics
12/13 PSI - Explorations on Quantum Information Lecture 13

David Cory Institute for Quantum Computing (IQC)
April 04, 2013

PIRSA:13040036
Quantum Information

Title	Date	Collection	Type	Info
The Death Throes of Massive Stars: Supernovae, Black Holes, and Neutrinos	2013‑04‑09	Cosmology and Gravitation	Scientific Series	View details
12/13 PSI - Explorations in Cosmology Lecture 2	2013‑04‑09	12/13 PSI - Explorations in Cosmology	Course	View details
Classical and quantum circuit obfuscation with braids	2013‑04‑08	Perimeter Institute Quantum Discussions	Scientific Series	View details
12/13 PSI - Explorations in String Theory Lecture 1	2013‑04‑08	12/13 PSI - Eplorations in String Theory	Course	View details
12/13 PSI - Explorations in Cosmology Lecture 1	2013‑04‑08	12/13 PSI - Explorations in Cosmology	Course	View details
2D to 4D Correspondence: Towers of Kinks versus Towers of Monopoles	2013‑04‑05	Quantum Fields and Strings	Scientific Series	View details
12/13 PSI - Explorations in Particle Theory Lecture 14	2013‑04‑05	12/13 PSI - Explorations in Particle Theory	Course	View details
12/13 PSI - Explorations on Quantum Information Lecture 14	2013‑04‑05	12/13 PSI - Explorations on Quantum Information	Course	View details
Advanced General Relativity - Lecture 22	2013‑04‑04	Elements of General Relativity	Course	View details
Fundamental Physics with Optically Levitated Dielectric Objects	2013‑04‑04	Strong Gravity	Scientific Series	View details
12/13 PSI - Explorations in Particle Theory Lecture 13	2013‑04‑04	12/13 PSI - Explorations in Particle Theory	Course	View details
12/13 PSI - Explorations on Quantum Information Lecture 13	2013‑04‑04	12/13 PSI - Explorations on Quantum Information	Course	View details

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