2-7 June 2019
Simon Fraser University
America/Vancouver timezone
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Cuscuton Bounce

3 Jun 2019, 10:45
30m
SCB 9242 (Simon Fraser University)

SCB 9242

Simon Fraser University

Invited Speaker / Conférencier(ère) invité(e) Theoretical Physics / Physique théorique (DTP-DPT) M1-4 Mathematical Physics (DTP) | Physique mathématique (DPT)

Speaker

Dr Ghazal Geshnizjani (University of Waterloo/Perimeter Institute)

Description

In general relativity producing a regular bounce entails violation of Null Energy Condition for a dynamical source in the model.
That generically indicates existence of ghosts or other instabilities.
However, in cuscuton modification of gravity, the correspondence between a background bounce and violation of Null Energy Condition for dynamical sources is broken.
Cuscuton action, modifies equations of motion in Infra Red limit allowing the background to go through a regular bounce phase.
At the same time, since it does not contain any dynamical degrees of freedom, it does not lead to ghosts or other instabilities.
Here, I present a toy scenario of a regular bouncing cosmology and prove this claim

Primary author

Dr Ghazal Geshnizjani (University of Waterloo/Perimeter Institute)

Presentation Materials

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