2018 CAP Congress / Congrès de l'ACP 2018

Session

W2-4 General Relativity II (DTP) | Relativité générale II (DPT)

W2-4

13 Jun 2018, 11:30

Dalhousie University

Conveners

W2-4 General Relativity II (DTP) | Relativité générale II (DPT)

• Masoud Ghezelbash (University of Saskatchewan)

2326. Surprising consequences of a positive cosmological constant (I)

Dr Beatrice Bonga (Perimeter Institute)

13/06/2018, 11:30

Theoretical Physics / Physique théorique (DTP-DPT)

Invited Speaker / Conférencier(ère) invité(e)

The study of isolated systems has been vastly successful in the context of vanishing cosmological constant, Λ=0. However, there is no physically useful notion of asymptotics for the universe we inhabit with Λ>0. The full non-linear framework is still under development, but some interesting results at the linearized level have been obtained. I will focus on the conceptual subtleties that arise...

2209. The nuts and bolts of higher curvature gravity (G)*

Mr Robie Hennigar (University of Waterloo)

13/06/2018, 12:00

Theoretical Physics / Physique théorique (DTP-DPT)

Oral Competition (Graduate Student) / Compétition orale (Étudiant(e) du 2e ou 3e cycle)

I will discuss recent work constructing Taub-NUT/Bolt solutions in general higher curvature theories of gravity. A broad class of theories known as generalized quasi-topological gravities (that include general relativity as a special case) allow for results non-perturbative in the higher curvature couplings, and we see a number of interesting differences compared to general relativity. General...

2284. *** Withdrawn *** Cuscuton Bounce (G)*

Hyung Jin Kim (University of Waterloo)

13/06/2018, 12:15

Oral Competition (Graduate Student) / Compétition orale (Étudiant(e) du 2e ou 3e cycle)

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...