Chameleon dark matter stars

TL;DR

This paper investigates how nonminimal coupling between fermionic dark matter and a quintessence scalar field affects the properties of dark matter stars, showing that such coupling results in smaller, more compact configurations.

Contribution

It introduces a model of dark matter stars with nonminimal coupling to dark energy and analyzes how this coupling influences their mass and size.

Findings

Dark matter stars are smaller with scalar field coupling.

Nonminimal coupling reduces the mass and size of dark matter configurations.

Scalar field coupling affects the equilibrium properties of dark matter stars.

Abstract

We consider static, spherically symmetric equilibrium configurations consisting of fermionic dark matter nonminimally coupled to dark energy in the form of a quintessence scalar field. With the scalar field coupling function, the form of which is taken to meet cosmological observations, we estimate the effect of such a nonminimal coupling on the properties of dark matter compact configurations. We show that the masses and sizes of the resulting chameleon dark matter stars are smaller than those of systems with no field present.