Jun 15 – 17, 2023
Mount Allison University
Canada/Atlantic timezone

Tentative evidence for cosmological coupling of black holes and implications for dark energy

Jun 17, 2023, 11:00 AM
30m
Dunn 113 (Mount Allison University)

Dunn 113

Mount Allison University

67 York St., Sackville, New Brunswick
Relativity, Gravitation and Cosmology Relativity, Gravitation and Cosmology

Speaker

Valerio Faraoni

Description

Exact solutions of the Einstein equations describing black holes in cosmological backgrounds exhibit time-dependent masses over Hubble times. We report tentative evidence for such a cosmological coupling obtained by studying populations of supermassive black holes in a sequence of red elliptical galaxies spanning 9 billion years. If black holes are non-singular, they typically have de Sitter cores and interior stresses, which corrects the Einstein-Friedmann equations obtained by averaging matter over 180 Mpc. Then, the (conservative) collapse of first-generation stars converting into black holes a mere 3% of the baryons present at z=25 explains the cosmic acceleration without any dark energy outside (de Sitter-cored) black holes. This speculative model based only on GR and common ideas about black hole interiors is astrophysically testable and will be summarized in this talk.
[Based on D. Farrah et al, ApJ Lett. 944, L31 (2023)]

Primary author

Presentation materials