PIRSA:C09010 - New Prospects for Solving the Cosmological Constant Problem - 2009 Subscribe to podcast

The `Cosmological Constant Problem’ is one of most outstanding problems in theoretical physics. It is a significant theme of many current areas of research, both at theoretical level, and at the experimental level, via the increasing observational evidence for dark energy. However, the way researchers address this problem varies tremendously between different scientific communities. The principal aim of this workshop is to bring together leading researchers in neighboring fields, to reach a common understanding of the nature of the problem, and to share the tools used in addressing it. In parallel, this workshop aims at understanding how the different directions in solving the Cosmological Constant Problem are related as well as searching for genuinely new approaches to tackle the question.

Organizer(s): Niayesh Afshordi   Claudia de Rham   Ghazal Geshnizjani  

Collection URL: http://pirsa.org/C09010

PIRSA:09050068  ( MP4 Medium Res , MP3 , PDF ) Which Format? The Cosmological Constant Problem and Extra Dimensions Speaker(s): Cliff Burgess Abstract: TBA Date: 25/05/2009 - 9:00 am Collection: New Prospects for Solving the Cosmological Constant Problem - 2009 URL: http://pirsa.org/09050068/  Share:

PIRSA:09050069  ( MP4 Medium Res , MP3 , PDF ) Which Format? 6D Brane Models and their Perturbations Speaker(s): Susha Parameswaran Abstract: Models with two supersymmetric large extra dimensions (SLED) may provide a way to approach both the cosmological constant problem and dark energy. After reviewing these ideas, I shall discuss warped brane world solutions in 6D supergravity, as a laboratory in which to explore SLED and codimension ... read more Date: 25/05/2009 - 10:00 am Collection: New Prospects for Solving the Cosmological Constant Problem - 2009 URL: http://pirsa.org/09050069/  Share:

PIRSA:09050070  ( MP4 Medium Res , MP3 , PDF ) Which Format? Inflation on a codimension-two brane Speaker(s): Hyun Min Lee Abstract: We consider a codimension-2 brane inflation scenario in a warped flux compactification of 6D gauged supergravity. The volume modulus of the model is stabilized by means of potentials localized on the regularized background branes. We discuss the cosmological evolution of the world-volum... read more Date: 25/05/2009 - 11:15 am Collection: New Prospects for Solving the Cosmological Constant Problem - 2009 URL: http://pirsa.org/09050070/  Share:

PIRSA:09050071  ( MP4 Medium Res , MP3 , PDF ) Which Format? Infrared Modification of Gravity with Dynamical Torsion Speaker(s): Seifallah Randjbar-Daemi Abstract: Theories of gravity having connection as an independent dynamical variable can have a massive spin -2 particle together with the massless graviton in their spectrum. We study the potentiality of such models as a consistent infrared modification of gravity. It will be shown that these models are free... read more Date: 25/05/2009 - 12:00 pm Collection: New Prospects for Solving the Cosmological Constant Problem - 2009 URL: http://pirsa.org/09050071/  Share:

PIRSA:09050072  ( MP4 Medium Res , MP3 , PDF ) Which Format? Phenomenological Connections between Particle Physics and Dark Energy Speaker(s): Daniel Chung Abstract: I explore possible connections between the Higgs sector and dark energy Date: 25/05/2009 - 2:00 pm Collection: New Prospects for Solving the Cosmological Constant Problem - 2009 URL: http://pirsa.org/09050072/  Share:

PIRSA:09050076  ( MP4 Medium Res , MP3 , PDF ) Which Format? Positive and Negative Energy Symmetry and the Cosmological Constant Problem Speaker(s): John Moffat Abstract: The Hamiltonian for the quantized gravitational and matter fields contains both positive and negative energy particle contributions, which leads through a positive and negative energy symmetry of the vacuum to a cancellation of the zero-point vacuum energy and a vanishing cosmological constant in th... read more Date: 25/05/2009 - 2:45 pm Collection: New Prospects for Solving the Cosmological Constant Problem - 2009 URL: http://pirsa.org/09050076/  Share:

PIRSA:09050074  ( MP4 Medium Res , MP3 , PDF ) Which Format? LHC, ILC, and Quintessence Speaker(s): Lisa Everett Abstract: TBA Date: 25/05/2009 - 4:00 pm Collection: New Prospects for Solving the Cosmological Constant Problem - 2009 URL: http://pirsa.org/09050074/  Share:

PIRSA:09050073  ( MP4 Medium Res , MP3 , PDF ) Which Format? Cyclic Universe Speaker(s): Neil Turok Abstract: TBA Date: 25/05/2009 - 4:45 pm Collection: New Prospects for Solving the Cosmological Constant Problem - 2009 URL: http://pirsa.org/09050073/  Share:

PIRSA:09050078  ( MP4 Medium Res , MP3 , PDF ) Which Format? Where in the String Landscape is Quintessence. Speaker(s): Nemanja Kaloper Abstract: I will make the case that the Bousso-Polchinski landscape may contain quintessential corners. Date: 26/05/2009 - 9:30 am Collection: New Prospects for Solving the Cosmological Constant Problem - 2009 URL: http://pirsa.org/09050078/  Share:

PIRSA:09050082  ( MP4 Medium Res , MP3 , PDF ) Which Format? Dilution of the Cosmological Constant: Higher Codimension Branes and Higher Curvature Terms Speaker(s): Alberto Iglesias Abstract: TBA Date: 26/05/2009 - 10:45 am Collection: New Prospects for Solving the Cosmological Constant Problem - 2009 URL: http://pirsa.org/09050082/  Share: