Cuscuton Bounce

غزال گشنیزجانی

Ghazal Geshnizjani

Department of Applied Mathematics,

Waterloo Centre for Astrophysics University of Waterloo

Affiliate and PSI Fellow, Perimeter Institute for Theoretical Physics

**لطفا  به ساعت نامتعارف سمینار توجه فرمایید**

Abstract: In general relativity producing a regular bounce entails violation of Null Energy Condition for a dynamical source in the model. That generically indicates the 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 InfraRed 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.

یکشنبه 7 اردیبهشت 1399، ساعت 17:00

Sunday 26 April, 2020 – 17:00 Tehran Time

  اتاق سمینار مجازی –Virtual Seminar Room

https://vclass.ecourse.sharif.edu/ch/cosmology

گزینه ورود به صورت مهمان – Enter as a Guest