Hints on halo evolution in SFDM models with galaxy observations

TL;DR

This paper uses galaxy strong lensing observations to constrain scalar field dark matter models, highlighting discrepancies in halo properties between dwarf and lens galaxies and emphasizing the need to understand halo evolution with baryonic effects.

Contribution

It provides observational constraints on SFDM models from galaxy lensing data and discusses the importance of baryons in halo evolution.

Findings

Discrepancies in halo properties between dwarf and lens galaxies.

Halo parameters are directly related to physical quantities in the model.

Baryons may significantly influence halo evolution in SFDM models.

Abstract

A massive, self-interacting scalar field has been considered as a possible candidate for the dark matter in the universe. We present an observational constraint to the model arising from strong lensing observations in galaxies. The result points to a discrepancy in the properties of scalar field dark matter halos for dwarf and lens galaxies, mainly because halo parameters are directly related to physical quantities in the model. This is an important indication that it becomes necessary to have a better understanding of halo evolution in scalar field dark matter models, where the presence of baryons can play an important role.