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Dark atoms and composite dark matter

by James M. Cline

This Submission thread is now published as

Submission summary

Authors (as registered SciPost users): James Cline
Submission information
Preprint Link:  (pdf)
Date accepted: 2021-11-24
Date submitted: 2021-11-17 15:43
Submitted by: Cline, James
Submitted to: SciPost Physics Lecture Notes
Ontological classification
Academic field: Physics
  • Gravitation, Cosmology and Astroparticle Physics
  • High-Energy Physics - Phenomenology
Approaches: Theoretical, Phenomenological


I selectively review the theoretical properties and observational limits pertaining to dark atoms, as well as composite dark matter candidates bound by a confining gauge interaction: dark glueballs, glueballinos, mesons and baryons. Emphasis is given to cosmological, direct and indirect detection constraints.

Published as SciPost Phys. Lect. Notes 52 (2022)

Author comments upon resubmission

Thanks to the referees for helpful comments and suggestions. I have implemented them as described below.

List of changes

Above eq. (3), clarified that dark recombination occurs below the binding energy, due to small abundance of baryons.

Added paragraph at end of section 2.1 to discuss reionization of dark atoms by shock heating during structure formation.

Below eq. (10), added caveats concerning recent progress in identifying missing satellites, and the role of baryonic feedback.
Added references here.

At end of section 2.4, added discussion about the possible size of symmetric component of dark matter, and updated fig. 5 to illustrate this point.

Restored missing partial derivative symbols above eq. (26).

Below eq. (28), qualified the statement about ionized remnants being swept out of the galaxy by supernovae shocks, and added references.

Added brief discussion and reference to twin Higgs mirror sector at end of section 2.7.1.

Fixed (left)->(right) in caption of Fig. 10

Below eq. (31), added mention of MW satellite counts and reference, for constraining warm DM.

Fixed power of M in Fig. 12 caption.

Added discussion and references below eq. (37).

Below eq. (40), added clarification of pion decay constant definition.

Added footnote 7 and reference to discuss instability of DM candidate in SO(6)/SO(5) composite Higgs model.

Below eq. (48), fixed incorrect subscript.

Eq. (59), added PandaX-4T limit

Added acknowledgments.

Corrected typos found by student reader.

Submission & Refereeing History

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Resubmission 2108.10314v4 on 17 November 2021

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