PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE
Subscribe to podcastBounce Scenarios in Cosmology
Organizer(s): Neil Turok Steffen Gielen
Collection URL: http://pirsa.org/C17024
| start | 1 | 2 | >> |
 | Welcome and Opening Remarks Speaker(s): Steffen Gielen, Neil Turok
Abstract:
Date: 26/06/2017 - 10:00 am
Collection: Bounce Scenarios in Cosmology
|
 | Bounce in Loop Quantum Cosmology and its Implications Speaker(s): Abhay Ashtekar
Abstract: There is a huge body of work in Loop Quantum Cosmology comprising of several thousand journal articles. I will provide an overview of conclusions, focusing on the difficult conceptual and mathematical issues that accompany the notion of a bounce and opening the way for phenomenological implications ... read more
Date: 26/06/2017 - 10:05 am
Collection: Bounce Scenarios in Cosmology
|
 | Observable Consequences of a Bounce Speaker(s): Ue-Li Pen
Abstract: I discuss potentially observable signatures of scalar and tensor decaying modes, which do not exist in inflation, and could be a probe of a bouncing universe.
Date: 26/06/2017 - 10:50 am
Collection: Bounce Scenarios in Cosmology
|
 | Challenges for Bouncing Cosmologies Speaker(s): Robert Brandenberger
Abstract: I will review various approaches to bouncing cosmologies and will discuss challenges which the different approaches face.
Date: 26/06/2017 - 2:00 pm
Collection: Bounce Scenarios in Cosmology
|
 | Emergent bouncing cosmology from quantum gravity condensates Speaker(s): Edward Wilson-Ewing
Abstract: I will explain how cosmological dynamics emerge from the hydrodynamics of isotropic group field theory condensate states in the Gross-Pitaevskii approximation. The correct Friedmann equations are recovered in the classical limit for some choices of the parameters in the action for the group field th... read more
Date: 26/06/2017 - 2:45 pm
Collection: Bounce Scenarios in Cosmology
|
 |
 | Unitary Cosmological Bounces Speaker(s): Claudia de Rham
Abstract: A non-singular cosmological bounce in the Einstein frame can only take place if the Null Energy Condition (NEC) is violated. I will explore the constraints imposed by demanding tree level unitarity on a cosmological background in single scalar field theories before focusing on the explicit constrain... read more
Date: 27/06/2017 - 10:00 am
Collection: Bounce Scenarios in Cosmology
|
 | Quantum cosmological instabilities - with and without boundaries Speaker(s): Jean-Luc Lehners
Abstract: The big bang singularity might be avoided by replacing it with a theory of initial conditions, or by considering a bounce from an earlier contracting phase. I will describe how both proposals can run into difficulties with instabilities when the spacetime must be treated semi-classically (i.e. when ... read more
Date: 27/06/2017 - 10:45 am
Collection: Bounce Scenarios in Cosmology
|
 | Space(-time) structure in models of loop quantum gravity Speaker(s): Martin Bojowald
Abstract: Loop quantum gravity has suggested modifications of the dynamics of cosmological models that could lead to a bounce at large curvature. However, the same modifications may alter the gauge structure of the theory, which is related to the structure of space-time. In a large class of examples the spac... read more
Date: 27/06/2017 - 2:00 pm
Collection: Bounce Scenarios in Cosmology
|
 | A Bouncing Universe approach to Fine Tuning Speaker(s): Stephon Alexander
Abstract:
Date: 27/06/2017 - 2:45 pm
Collection: Bounce Scenarios in Cosmology
|
| start | 1 | 2 | >> |
