2021 CAP Virtual Congress / Congrès virtuel de l'ACP 2021

Session

TS1-4 Early Universe (DTP Symposium on Cosmology: James Peebles Nobel Celebration) / L'univers jeune (Symposium DPT sur la cosmologie: le prix Nobel de James Peebles)

TS1-4

Jun 8, 2021, 3:44 PM

Underline Conference System

185. (I) Some challenges for theoretical cosmology

Edward Wilson-Ewing (University of New Brunswick)

6/8/21, 3:45 PM

Symposia Day (DTP) - Cosmology/Jim Peebles celebration

Invited Speaker / Conférencier(ère) invité(e)

I will review some important challenges for theoretical cosmology, focusing on the trans-Planckian problem for inflation and the anisotropy problem for matter bounce and ekpyrosis, and I will discuss some recent work exploring particular aspects of these problems.

677. (I) Spectrum of Cuscuton Bounce

Ghazal Geshnizjani (University of Waterloo)

6/8/21, 4:10 PM

Symposia Day (DTP) - Cosmology/Jim Peebles celebration

Invited Speaker / Conférencier(ère) invité(e)

I will argue why we need to remain objective about the physics of the early universe and explore different scenarios. In particular, I will present a cosmological bounce model based on Cuscuton gravity that does not have any ghosts or curvature instabilities. I will then discuss if Cuscuton bounce can provide an alternative to inflation for generating near scale-invariant scalar perturbations....

679. (I) Discriminating between theories of the very early universe

Jerome Quintin (Max Planck Institute for Gravitational Physics)

6/8/21, 4:35 PM

Symposia Day (DTP) - Cosmology/Jim Peebles celebration

Invited Speaker / Conférencier(ère) invité(e)

Different theories of the very early universe that can explain our observations of the cosmic microwave background are presented. The current paradigm - inflationary cosmology - has received much attention, but it is not the only theoretically viable explanation; indeed, several alternative scenarios exist. It thus bares the question: how can we discriminate between the various theories, both...