The properties of dark matter

TL;DR

This paper reviews how galaxy and cluster density profiles inform dark matter properties, emphasizing stable halo formation by low-mass collisional fluids over high-mass particle models, and discusses detection methods.

Contribution

It highlights the likelihood of stable halos formed by low-mass collisional fluids as the best explanation for observed density profiles, contrasting with high-mass particle models.

Findings

Stable halos are likely formed by low-mass collisional fluids.

High-mass particle halos cannot easily explain observed density distributions.

Detection methods for dark matter are discussed.

Abstract

Observations of density profiles of galaxies and clusters constrain the properties of dark matter. Formation of stable halos by collisional fluids with very low mass particles appears as the most probable interpretation, while halos formed by high mass particles, left over from a hot big bang, can scarcely explain the observed density distributions. Detection methods of dark matter are discussed.