UMR 5672

logo de l'ENS de Lyon
logo du CNRS logo UCBL
You are here: Home / Seminars / Seminars organized jointly with iP2i / Soft degrees of freedom, Gibbons-Hawking contribution and Casimir effect

Soft degrees of freedom, Gibbons-Hawking contribution and Casimir effect

G. Barnich (Université libre de Bruxelles et International Solvay Institutes, Belgique)
When Nov 04, 2019
from 04:00 PM to 05:00 PM
Where ENS de Lyon - Salle 117
Attendees Glenn Barnich
Add event to calendar vCal
iCal

Lundi 4 novembre


 

Title: Soft degrees of freedom, Gibbons-Hawking contribution and Casimir effect

Glenn Barnich (Université libre de Bruxelles et International Solvay Institutes, Belgique)

 

Abstract:

The semiclassical contribution to the partition function is obtained by evaluating the Euclidean action improved through suitable boundary terms. We address the question of which degrees of freedom are responsible for this contribution. A physical toy model for the gravitational problem is a charged vacuum capacitor.  For a planar charged vacuum capacitor with perfectly conducting plates, we identify the degrees of freedom that, in the quantum theory, give rise to additional contributions to the standard black body result proportional to the area of the plates. They allow for a microscopic derivation of the thermodynamics of the charged capacitor and contribute to Casimir effect at finite temperature and thus to the entropy.