PIRSA:10100057

Why is the generalized second law true?

APA

(2010). Why is the generalized second law true?. Perimeter Institute for Theoretical Physics. https://pirsa.org/10100057

MLA

Why is the generalized second law true?. Perimeter Institute for Theoretical Physics, Oct. 12, 2010, https://pirsa.org/10100057

BibTex

          @misc{ scivideos_PIRSA:10100057,
            doi = {10.48660/10100057},
            url = {https://pirsa.org/10100057},
            author = {},
            keywords = {Cosmology},
            language = {en},
            title = {Why is the generalized second law true?},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2010},
            month = {oct},
            note = {PIRSA:10100057 see, \url{https://scivideos.org/index.php/pirsa/10100057}}
          }
          
Talk numberPIRSA:10100057
Source RepositoryPIRSA
Talk Type Scientific Series
Subject

Abstract

The entropy outside of an event horizon can never decrease if one includes a term proportional to the horizon area. For a long time, this astonishing result had only been shown for quantum fields that are in an approximately steady state. I will describe a new proof of the generalized second law for arbitrary slices of semiclassical, rapidly-changing horizons. I will start with the simplest case, Rindler horizons, and then describe how the proof can be adapted to other cases (black holes, de Sitter, etc.) by restricting the field algebra to the horizon. The generalized second law holds because the horizon is invariant under a larger symmetry group than the rest of the spacetime.