We will have a talks on Gravitational Observatories by Chawakorn Maneerat at Anyamanee 6th floor from 3pm to 5pm on Friday 23/09/2024.

Abstract : Finding a set of gauge invariant observables in a theory of (semi-)classical gravity is a challenging task. One way to achieve this is by woking on a manifold with timelikes boundaries, in which  boundary conditions should be imposed. In this talk, we present an analysis of linearised dynamics of pure Einstein gravity and thermodynamics of black holes without a cosmological constant. The novelty of this work is that we impose conformal boundary conditions, in which we fix conformal class of the induced metric and the trace of the extrinsic curvature. These boundary conditions are conjectured to be well-posed as opposed to the standard Dirichlet boundary conditions. If time permits, we will briefly comment on the case of positive cosmological constant.