Formation of a galaxy with a central black hole in the Lemaitre-Tolman model

TL;DR

This paper models galaxy formation with a central black hole using Lemaitre-Tolman solutions, exploring initial fluctuations and black hole types, including collapsed objects and wormhole structures, with focus on horizon properties.

Contribution

It applies Lemaitre-Tolman models to simulate galaxy and black hole formation from initial fluctuations, including novel considerations of black hole types and horizon analysis.

Findings

Black holes can be modeled as collapsed objects or wormholes within the galaxy formation process.

The models demonstrate evolution from initial density/velocity profiles to final galaxy structures.

Analysis of apparent and event horizons provides insights into black hole properties in cosmological contexts.

Abstract

We construct two models of the formation a galaxy with a central black hole, starting from a small initial fluctuation at recombination. This is an application of previously developed methods to find a Lemaitre-Tolman model that evolves from a given initial density or velocity profile to a given final density profile. We show that the black hole itself could be either a collapsed object, or a non-vacuum generalisation of a full Schwarzschild-Kruskal-Szekeres wormhole. Particular attention is paid to the black hole's apparent and event horizons.