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PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

PIRSA:C11008 - Challenges for Early Universe Cosmology - 2011PODCAST Subscribe to podcast

Challenges for Early Universe Cosmology

Organizer(s):

Collection URL: http://pirsa.org/C11008


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PIRSA:11070024  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Selection of the Initial Conditions from the Landscape Multiverse
Abstract: I will briefly review the predictions of the theory of the Selection of the Initial Conditions of the Universe from the Landscape Multiverse and focus on recent and upcoming evidence. In this theory, the wavefunction of the universe propagating on the landscape is localized via Anderson localization... read more
Date: 14/07/2011 - 4:00 pm

PIRSA:11070013  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Antigravity Predicted Between Crunch and Bang in a Cyclic Universe
Speaker(s): Itzhak Bars
Abstract: Einstein's theory of General Relativity and its couplings to matter in 3+1 dimensions can be slightly enlarged with the requirement of a local scale (conformal) symmetry and the corresponding gauge degrees of freedom. This form of the theory is a prediction from 2T-gravity in 4+2 dimensions. It has ... read more
Date: 14/07/2011 - 4:30 pm

PIRSA:11070022  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Curvature and Anisotropy Near a Nonsingular Bounce
Speaker(s): BingKan Xue
Abstract: Problematic growths of curvature and anisotropy are found in nonsingular bouncing cosmologies that include both an ekpyrotic phase and a bouncing phase. Classically, initial curvature and anisotropy that are suppressed during the ekpyrotic phase will grow back exponentially during the nonsingular bo... read more
Date: 14/07/2011 - 5:00 pm

PIRSA:11070018  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Inflationary Cosmology: A Holographic Perspective
Speaker(s): Paul McFadden
Abstract: We present a holographic framework for inflationary universes, in particular those that are either asymptotically de Sitter or asymptotically power-law. This framework reveals how cosmological observables, including the primordial power spectrum and non-Gaussianities, are encoded in the correlation ... read more
Date: 14/07/2011 - 5:30 pm

PIRSA:11070040  ( MP4 Medium Res , MP3 , PDF ) Which Format?
TBA
Speaker(s): Leonard Susskind
Abstract: TBA
Date: 15/07/2011 - 9:00 am

PIRSA:11070025  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Probability and Anthropic Reasoning in Small, Large, and Infinite Universes
Speaker(s): Radford Neal
Abstract: I will argue that anthropic reasoning is unnecessary or misleading when the universe/multiverse is small enough that another observer with exactly your memories is unlikely to exist. Instead, one can evaluate theories or make predictions in the standard Bayesian way, based on the conditional probabi... read more
Date: 15/07/2011 - 9:50 am

PIRSA:11070007  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Holographic Cosmology Inflation and Entropy
Speaker(s): Tom Banks
Abstract: I provide a mathematical model of holographic cosmology whose coarse grained description is that of a homogeneous isotropic, flat universe, which makes a transitions from an FRW to an eternal de Sitter regime.&nbsp;Based on this model, I suggest some heuristic ideas which explain the low ini... read more
Date: 15/07/2011 - 11:20 am

PIRSA:11070021  ( MP4 Medium Res , MP3 , PDF ) Which Format?
A Simple Harmonic Universe
Speaker(s): Gonzalo Torroba
Abstract: We explore simple but novel solutions of general relativity which, classically, approximate cosmologies cycling through an infinite set of ``bounces." These solutions require curvature K=+1, and are supported by a negative cosmological term and matter with -1 < w < -1/3. They ... read more
Date: 15/07/2011 - 4:00 pm

PIRSA:11070019  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Infrared Challenges for Inflation
Speaker(s): Sarah Shandera
Abstract: I will review some recent work on infrared issues for scalar fields in exact and quasi de Sitter space. Renewed interest in this topic has been driven by the observational potential for a more accurate determination of statistics of the primordial curvature perturbations, especially non-Gaussianity.... read more
Date: 15/07/2011 - 4:30 pm

PIRSA:11070046  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Galilean Genesis
Speaker(s): Alberto Nicolis
Abstract: We propose a novel cosmological scenario, in which standard inflation is replaced by an expanding phase with a drastic violation of the Null Energy Condition (NEC): dot H >> H^2. The model is based on the recently introduced Galileon theories, which allow NEC violating solutions withou... read more
Date: 15/07/2011 - 5:00 pm

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