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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:11070038  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Boundary Theory and the Measure Problem
Speaker(s): Jaume Garriga
Abstract: TBA
Date: 13/07/2011 - 11:20 am

PIRSA:11070028  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Does the Cyclic Universe Avoid the Measure Problem?
Speaker(s): Jean-Luc Lehners
Abstract: In its best understood version, the Steinhardt-Turok cyclic universe contains two crucial ingredients: an unstable field trajectory during the ekpyrotic phase, and the subsequent brane collision corresponding to the crunch/bang transition. These two features act as strong selection principles and de... read more
Date: 13/07/2011 - 12:10 pm

PIRSA:11070033  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Transdimensional Tunneling in the Multiverse
Abstract: I will introduce a simple 6d model of flux compactification that shows a remarkable rich landscape of vacua with different number of large and compact dimensions. I will then describe the instantons interpolating between these different vacua as well as some the implications of a transdimensional mu... read more
Date: 13/07/2011 - 4:00 pm

PIRSA:11070023  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Physics Beyond the Standard Theory of Inflation and Dark Energy
Speaker(s): Vitaly Vanchurin
Abstract: Inflationary cosmology not only provided a simple solution to various cosmological problems, but also made predictions later confirmed by observations. Despite of its success, a straightforward extrapolation of the theory to higher energy scales led to new problems and seems to require new physics. ... read more
Date: 13/07/2011 - 4:30 pm

PIRSA:11070020  ( MP4 Medium Res , MP3 , PDF ) Which Format?
A critique of Coleman - De Luccia
Speaker(s): Ben Shlaer
Abstract: In many respects, de Sitter space behaves like a system at finite temperature in finite volume. I will extend this to include the lack of first-order phase transitions. This rules out exponential decay in the de Sitter landscape, which changes the global structure in a significant way.
Date: 13/07/2011 - 5:00 pm

PIRSA:11070027  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Populating the Whole Landscape
Speaker(s): Adam Brown
Abstract:
Date: 13/07/2011 - 5:30 pm

PIRSA:11070039  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Infinity, Finiteness and Inflationary Cosmology
Speaker(s): Andreas Albrecht
Abstract: I analyze the various roles of infinity in current thinking about cosmology. Topics include initial conditions, attractor behavior, inflation and the precision and meaning of quantum measurements. I review the de Sitter equilibrium cosmology as an example of a finite cosmology, and present some new ... read more
Date: 14/07/2011 - 9:00 am

PIRSA:11070017  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Scale Invariance from Spontaneous Breaking of Conformal Symmetry
Speaker(s): Justin Khoury
Abstract: I will discuss a novel framework of the very early universe which addresses the traditional horizon and flatness problems of big bang cosmology and predicts a scale invariant spectrum of perturbations. Unlike inflation, this scenario requires no exponential superluminal expansion of space-time... read more
Date: 14/07/2011 - 9:50 am

PIRSA:11070029  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Meeting the Challenges
Speaker(s): Paul Steinhardt
Abstract: This talk will be a heuristic discussion of the challenges for the big bang inflationary picture and possible approaches for addressing them.
Date: 14/07/2011 - 11:20 am

PIRSA:11070010  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Conformal Cyclic Cosmology: Some Striking New Observational Support
Speaker(s): Roger Penrose
Abstract:
Date: 14/07/2011 - 12:10 pm

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