The Physical Effects of Self-interacting Dark Matter

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Source arXiv

Astrophysics of Galaxies

High Energy Physics - Phenomenology

Cosmology and Nongalactic Astrophysics

The Physical Effects of Self-interacting Dark Matter

Astrophysical Tests of Dark Matter Self-Interactions

Self-interacting dark matter (sidm) arises generically in scenarios for physics beyond the standard model that have dark sectors with light mediators or strong dynamics.

The self-interactions allow energy and momentum transport through halos, altering their structure and dynamics relative to those produced by collisionless dark matter.

This review provides a comprehensive explanation of the physicaleffects of dark matter self-interactions in objects ranging from galactic satellites (dark and luminous) to clusters of galaxies and the large-scale structure.

The second major part describes the methods used to constrain sidm models including current constraints, with the aim of advancing tests with upcoming galaxy surveys.

This part also provides a detailed review of the unresolved small-scale structure formation issues and concrete ways to test simple sidm models.

The review is rounded off by a discussion of the theoretical motivation for self-interactions, degeneracies with baryonic and gravitational effects, extensions to the single-component elastic-interactions framework, and future observational and theoretical prospects.

Authors

Susmita Adhikari, Arka Banerjee, Kimberly K. Boddy, Francis-Yan Cyr-Racine, Harry Desmond, Cora Dvorkin, Bhuvnesh Jain, Felix Kahlhoefer, Manoj Kaplinghat, Anna Nierenberg, Annika H. G. Peter, Andrew Robertson, Jeremy Sakstein, Jesús Zavala

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