Stationary massive disks around black holes: realistic equation of state and bifurcation

TL;DR

This paper investigates stationary black hole-disk systems with realistic equations of state, revealing bifurcation phenomena and the conditions for the existence of moderately massive Keplerian disks.

Contribution

It introduces a detailed analysis of bifurcation in black hole-disk solutions using realistic equations of state and specific rotation laws.

Findings

Existence of two bifurcating solution branches.

Low entropy nuclear matter supports moderately massive Keplerian disks.

Bifurcation depends on specific entropy and rotation law parameters.

Abstract

We study stationary and axially symmetric black hole-disk systems, assuming a combination of the DD2 and Timmes-Swesty equations of state and a three-parameter family of rotation laws. There exist two branches of solutions that are shown to bifurcate, for a suitable specific entropy and a parameter in the rotation law. Low entropy nuclear matter allows for the existence of moderately massive Keplerian disks.