Small-scale clumps of dark matter

TL;DR

This paper reviews the formation, evolution, and characteristics of small-scale dark matter clumps, discussing their dependence on primordial spectra, implications for detection experiments, and related astrophysical phenomena.

Contribution

It provides a comprehensive overview of the current understanding of small-scale dark matter clumps, including formation processes, models, and their role in indirect detection.

Findings

Dark matter clumps vary with primordial spectra.

Clumps influence indirect detection signals.

Astrophysical phenomena are linked to dark matter clumps.

Abstract

Small-scale clumps of dark matter are gravitationally bounded structures that have masses comparable to or lower than stellar masses and consist of noninteracting or weakly interacting dark matter particles. In this paper, the current knowledge about the formation and evolution of such structures is reviewed, various types of spectra of primordial cosmological perturbations are considered, and various dark matter models are discussed. Depending on the particular spectrum type, dark matter clumps may differ considerably in their formation processes and ultimate characteristics. The role of clumps in experiments on indirect detection of dark matter particles via their annihilation products is discussed. A number of astrophysical problems and phenomena that are related to dark matter clumps are examined.