10-16 June 2018
Dalhousie University
America/Halifax timezone
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*** Withdrawn *** Cuscuton Bounce (G)*

13 Jun 2018, 12:15
15m
SUB 302 (cap.40) (Dalhousie University)

SUB 302 (cap.40)

Dalhousie University

Oral Competition (Graduate Student) / Compétition orale (Étudiant(e) du 2e ou 3e cycle) W2-4 General Relativity II (DTP) | Relativité générale II (DPT)

Speaker

Hyung Jin Kim (University of Waterloo)

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 is an Infra Red modification and it can make the background go through a regular bounce. At the same time, since it does not contain any dynamical degrees of freedom, it does not lead to ghosts or other instabilities. Here, we present a toy scenario of a regular bouncing cosmology and prove this claim. Our model is presented as a proof of concept at this point and does not aim to explain observations in late time cosmology.

Primary authors

Dr Ghazal Geshnizjani (University of Waterloo; Perimeter Institute) Hyung Jin Kim (University of Waterloo) Mr Supranta Boruah (University of Waterloo)

Presentation Materials

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