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PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

PIRSA:C08012 - PASCOS 08PODCAST Subscribe to podcast

14th International Symposium on Particles, Strings and Cosmology (PASCOS '08)

Organizer(s): Robert Myers   Freddy Cachazo   Jaume Gomis   Cliff Burgess   Justin Khoury   James Taylor   Maxim Pospelov   Alex Buchel  

Collection URL: http://pirsa.org/C08012


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PIRSA:08060177  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Dark Energy, Induced Gravity and Broken Scale Invariance.
Abstract: We study the cosmological evolution of an induced gravity model with a self-interacting scalar field $sigma$ and in the presence of matter and radiation. Such model leads to Einstein Gravity plus a cosmological constant as a stable attractor among homogeneous cosmologies and is therefore a viable da... read more
Date: 06/06/2008 - 10:00 am
Collection: PASCOS 08

PIRSA:08060099  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Wilson Line Inflation
Abstract: I will present a model of inflation in string theory, where the inflaton field corresponds to a Wilson line in the worldvolume of a D-brane, and in the presence of magnetic flux. Inflation ends in a hybrid fashion, when the Wilson line achieves a critical value and an open string mode becomes tachy... read more
Date: 06/06/2008 - 11:15 am
Collection: PASCOS 08

PIRSA:08060085  ( MP4 Medium Res , MP3 , PDF ) Which Format?
U(1)_R mediation in 6D brane-world gauged supergravity
Speaker(s): Hyun Min Lee
Abstract: We construct a consistent supersymmetric action for chiral and vector multiplets living on codimension-two branes in a six-dimensional chiral gauged supergravity. A nonzero brane tension can be compatible with the bulk supersymmetry by introducing a brane-localized Fayet-Iliopoulos term proportional... read more
Date: 06/06/2008 - 11:15 am
Collection: PASCOS 08

PIRSA:08060098  ( MP4 Medium Res , MP3 , PDF ) Which Format?
The lessons from the running of the tensor-to-scalar ratio
Speaker(s): Jinn-Ouk Gong
Abstract: We derive a simple consistency relation from the running of the tensor-to-scalar ratio. This new relation is first order in the slow-roll approximation. While for single field models we can obtain what can be found by using other observables, multi-field cases in general give non-trivial contributio... read more
Date: 06/06/2008 - 11:15 am
Collection: PASCOS 08

PIRSA:08060179  ( MP4 Medium Res , MP3 , PDF ) Which Format?
A Singularity Problem with f(R) Dark Energy
Speaker(s): Andrei Frolov
Abstract: I point out that there is a curvature singularity problem appearing on non-linear level that generally plagues f(R) models that modify Einstein gravity in the infrared. It is caused by the fact that for the effective scalar degree of freedom, the curvatur
Date: 06/06/2008 - 11:30 am
Collection: PASCOS 08

PIRSA:08060180  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Non-Gaussianities from modified initial states
Speaker(s): Daniel Meerburg
Abstract: We consider the most general treatment of primordial non-Gaussianities, arising from modifying the initial state. Besides considering non-Gaussian effects due to subhorizon particle production, we parameterize the initial non-Gaussian features in terms of a Boundary Effective Field Theory (BEFT). Bo... read more
Date: 06/06/2008 - 11:30 am
Collection: PASCOS 08

PIRSA:08060178  ( MP4 Medium Res , MP3 , PDF ) Which Format?
The Wheeler-De Witt equation for brane gravity
Speaker(s): Pawel Gusin
Abstract: We consider the gravity in the system consisting of the BPS D3-brane embedded in the flat background geometry, produced by the solutions of the supergravity. The effective action for this system is represented by the sum of the Hilbert-Einstein and DBI actions. We derive the Wheeler-De Witt equation... read more
Date: 06/06/2008 - 11:30 am
Collection: PASCOS 08

PIRSA:08060183  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Gravitino Dark Matter and Implications for Phenomenology at the LHC
Speaker(s): Frank Steffen
Abstract: Considering gravitino dark matter scenarios, cosmological constraints on the sparticle masses and on the reheating temperature of inflation will be discussed. These constraints are relevant for prospects of phenomenology at the LHC and for our understanding of inflation and the baryon asymmetry of t... read more
Date: 06/06/2008 - 11:45 am
Collection: PASCOS 08

PIRSA:08060182  ( MP4 Medium Res , MP3 , PDF ) Which Format?
DM-TPC: a novel approach to directional Dark Matter detection Denis Dujmic (MIT) on behalf of the DM-TPC collaboration
Speaker(s): Denis Dujmic
Abstract: Directional detection of dark matter can provide unambiguous observation of dark matter (DM) interactions even in the presence of insidious backgrounds. The DM-TPC collaboration is developing a detector with the goal of measuring the direction and sense (''head-tail'') of nuclear recoils produced in... read more
Date: 06/06/2008 - 11:45 am
Collection: PASCOS 08

PIRSA:08060181  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Gravitational Wave constraints on multi-brane inflation
Speaker(s): Ian Huston
Abstract: A class of non-canonical inflationary models is identified, where the leading-order contribution to the non-Gaussianity of the curvature perturbation is determined by the sound speed of the fluctuations in the inflaton field. Included in this class of models is the effective action for multiple coin... read more
Date: 06/06/2008 - 11:45 am
Collection: PASCOS 08

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