Conveners
W2-4 General Relativity II (DTP) | Relativité générale II (DPT)
- Masoud Ghezelbash (University of Saskatchewan)
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...
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...
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...
