Graviscalar dark matter and smooth galaxy halos

TL;DR

This paper explores a model of dark matter as a graviscalar within unimodular metagravity, presenting a smooth halo solution that explains galaxy rotation curves without singularities.

Contribution

It introduces a regular, one-parameter graviscalar halo solution in unimodular metagravity, advancing the understanding of dark matter distribution in galaxies.

Findings

The solution exhibits a finite central density profile.

It reproduces the asymptotically flat galaxy rotation curves.

The model suggests a smooth, non-singular dark matter halo.

Abstract

In the framework of the unimodular metagravity, with the scalar graviton/graviscalar dark matter, a regular anomalous one-parameter solution to the static spherically symmetric metagravity equations in empty space is found. The solution presents a smooth graviscalar halo, with a finite central density profile, qualitatively reproducing the asymptotically flat rotation curves of galaxies. To refine the description studying the axisymmetric case in the presence of luminous matter is in order.