PIRSA:22050064

A coherent state description of black holes and the late Universe

APA

Giusti, A. (2022). A coherent state description of black holes and the late Universe. Perimeter Institute. https://pirsa.org/22050064

MLA

Giusti, Andrea. A coherent state description of black holes and the late Universe. Perimeter Institute, May. 26, 2022, https://pirsa.org/22050064

BibTex

          @misc{ pirsa_22050064,
            doi = {},
            url = {https://pirsa.org/22050064},
            author = {Giusti, Andrea},
            keywords = {Quantum Gravity},
            language = {en},
            title = {A coherent state description of black holes and the late Universe},
            publisher = {Perimeter Institute},
            year = {2022},
            month = {may},
            note = {PIRSA:22050064 see, \url{https://pirsa.org}}
          }
          

Abstract

Inspired by the corpuscular model of gravity, I will discuss a simplified quantum description of neutral and electrically charged spherically symmetric black holes given by coherent states of toy gravitons. From such states I will derive effective geometries devoid of curvature singularities (replaced by integrable ones) and Cauchy horizons. Lastly, I will present a similar analysis for the Schwarzschild-de Sitter geometry, used as a model for the late Universe, showing that the “reaction” of the de Sitter background to the presence of localised matter sources induces a modified Newtonian dynamics at galactic scales and different values measured for the present Hubble parameter.

Zoom Link: https://pitp.zoom.us/j/93087108672?pwd=ekQrLysrcjRwVWFSZ2J5bndteXBtdz09