PIRSA:12050053

Black Hole Entropy from Loop Quantum Gravity

Bianchi, E. (2012). Black Hole Entropy from Loop Quantum Gravity. Perimeter Institute. https://pirsa.org/12050053

Bianchi, Eugenio. Black Hole Entropy from Loop Quantum Gravity. Perimeter Institute, May. 30, 2012, https://pirsa.org/12050053 

          @misc{ pirsa_PIRSA:12050053,
            doi = {10.48660/12050053},
            url = {https://pirsa.org/12050053},
            author = {Bianchi, Eugenio},
            keywords = {Cosmology},
            language = {en},
            title = {Black Hole Entropy from Loop Quantum Gravity},
            publisher = {Perimeter Institute},
            year = {2012},
            month = {may},
            note = {PIRSA:12050053 see, \url{https://pirsa.org}}
          }

Eugenio Bianchi

Pennsylvania State University

Talk number
PIRSA:12050053
Collection
Talk Type
Subject
Abstract
There is strong theoretical evidence that black holes have a finite thermodynamic entropy equal to one quarter the area A of the horizon. Providing a microscopic derivation of the entropy of the horizon is a major task for a candidate theory of quantum gravity. Loop quantum gravity has been shown to provide a geometric explanation of the finiteness of the entropy and of the proportionality to the area of the horizon. The microstates are quantum geometries of the horizon. What has been missing until recently is the identification of the near-horizon quantum dynamics and a derivation of the universal form of the Bekenstein-Hawking entropy with its 1/4 prefactor. I report recent progress in this direction. In particular, I discuss the covariant spin foam dynamics and and show that the entropy of the quantum horizon reproduces the Bekenstein-Hawking entropy S=A/4 with the proper one-fourth coefficient for all values of the Immirzi parameter.