A solution of the coincidence problem based on the recent galactic core black hole mass density increase

TL;DR

This paper proposes a novel mechanism involving galactic core black hole mass density increase that naturally explains cosmic acceleration and addresses the coincidence problem, challenging previous assumptions about dark pressure in brane cosmology.

Contribution

It introduces a brane-bulk energy exchange mechanism linking black hole mass growth to dark pressure, providing a unified explanation for cosmic acceleration and the coincidence problem.

Findings

Galactic core black hole mass density increase triggers cosmic acceleration.

Negative dark pressure from black holes explains the coincidence problem.

Corrects misconceptions about positive dark pressure from escaping gravitons.

Abstract

A mechanism capable to provide a natural solution to two major cosmological problems, i.e. the cosmic acceleration and the coincidence problem, is proposed. A specific brane-bulk energy exchange mechanism produces a total dark pressure, arising when adding all normal to the brane negative pressures in the interior of galactic core black holes. This astrophysically produced negative dark pressure explains cosmic acceleration and why the dark energy today is of the same order to the matter density for a wide range of the involved parameters. An exciting result of the analysis is that the recent rise of the galactic core black hole mass density causes the recent passage from cosmic deceleration to acceleration. Finally, it is worth mentioning that this work corrects a wide spread fallacy among brane cosmologists, i.e. that escaping gravitons result to positive dark pressure.