Solving the Cusp-Core Problem with a Novel Scalar Field Dark Matter

TL;DR

This paper introduces a scalar field dark matter model that successfully reproduces observed galactic rotation curves and addresses the cusp-core problem faced by traditional cold dark matter models.

Contribution

It demonstrates that scalar field dark matter with specific boundary conditions can match observed galactic rotation profiles and resolve the cusp-core discrepancy.

Findings

Scalar field dark matter produces flat rotation curves at large radii.

The model achieves correct core scaling behavior.

It offers a solution to the cusp-core problem in galaxy modeling.

Abstract

Matos, Guzman and Nunez proposed a model of galactic halo based on an exponential-potential scalar field that could induce a rotation curve that is constant for all radii. We demonstrate that with suitable boundary conditions, such scalar field dark matter (SDM) can not only produce the observed constant rotation curve at large radius but also give rise to the correct power-law scaling near the galactic core region. This solves the existing cusp-core problem faced by the conventional cold dark matter (CDM) model.