Halos of Unified Dark Matter Scalar Field

TL;DR

This paper explores scalar field models with non-canonical kinetic terms that can simultaneously explain dark matter halos and the universe's accelerated expansion, matching observational rotation curves.

Contribution

It introduces a method to derive static, spherically symmetric solutions for scalar fields that unify dark matter and dark energy within a single framework.

Findings

Scalar field Lagrangians can reproduce observed galaxy rotation curves.

Unified dark fluid models fit cosmological background evolution.

Existence of solutions matching both dark matter halos and cosmic acceleration.

Abstract

We investigate the static and spherically symmetric solutions of Einstein's equations for a scalar field with non-canonical kinetic term, assumed to provide both the dark matter and dark energy components of the Universe. In particular, we give a prescription to obtain solutions (dark halos) whose rotation curve v_c(r) is in good agreement with observational data. We show that there exist suitable scalar field Lagrangians that allow to describe the cosmological background evolution and the static solutions with a single dark fluid.