Solitons and Black Holes in a Generalized Skyrme Model with Dilaton-Quarkonium field

TL;DR

This paper introduces new self-gravitating soliton and black hole solutions in a generalized Skyrme model with a dilaton field, analyzing their properties numerically and establishing the stability of certain black-hole branches.

Contribution

The study extends the Skyrme model by incorporating a dilaton field, providing new solutions and stability analysis using the turning point method.

Findings

Dilaton presence does not qualitatively alter solutions

New self-gravitating soliton and black hole solutions found

One black-hole branch identified as unstable

Abstract

Skyrme theory is among the viable effective theories which emerge from low-energy limit of quantum chromodynamics. Many of its generalizations include also a dilaton. Here we find new self-gravitating solutions, both solitons and black holes, in a Generalized Skyrme Model (GSM) in which a dilaton is present. The investigation of the properties of the solutions is done numerically. We find that the introduction of the dilaton in the theory does not change the picture qualitatively, only quantitatively. The model considered here has one free parameter more than the Einstein-Skyrme model which comes from the potential of the dilaton. We have applied also the turning point method to establish that one of the black-hole branches of solutions is unstable. The turning point method here is based on the first law of black-hole thermodynamics a detailed derivation of which is given in the Appendix of the paper.