[Astro] [CAPT] Special Gravity / Particle Cosmology / Gravity Lab Seminar Tue 18 Nov 3pm: José Padua-Argüelles

[Jorma Louko (staff)]

Special seminar

Tuesday 18 November 3pm, Physics B17

José Padua-Argüelles (Perimeter Institute and University of Waterloo)

Title: Entropies for gravitational systems from simplicial Lorentzian path integrals

Abstract: Recent advances have argued how gravitational entropies can be computed directly from Lorentzian path integrals, avoiding the problems of Euclidean methods associated with the conformal factor problem that makes a path integral over Euclidean geometries manifestly ill defined. In particular, the de Sitter horizon entropy can be recovered from a real-time path integral that computes the dimension of the Hilbert space associated with a spatial ball. Similarly, the swap entropy of an evaporating black hole (central to the replica paradigm resolution of the black hole information paradox) can be computed in this way. Quantum Regge Calculus, a lattice-like approach to quantum gravity, enables concrete realizations of these scenarios, providing insights beyond continuum methods. This perspective clarifies aspects of gravitational path integrals and may have implications for approaches such as causal dynamical triangulations and spin foams, where Regge-like formulations play a fundamental role.



| Jorma Louko

| School of Mathematical Sciences

| University of Nottingham          Tel: +44 115 95 14942

| Nottingham NG7 2RD         jorma.louko at nottingham.ac.uk

| United Kingdom         www.nottingham.ac.uk/mathematics




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