Report/Journal Article

PUBDB-2018-03277

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Asymmetric dark matter: residual annihilations and self-interactions

Baldes, I. (Corresponding author)DESY* ; Cirelli, M. ; Panci, P. ; Petraki, K. ; Sala, F.DESY* ; Taoso, M.

2018
SciPost Foundation Amsterdam

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Please use a persistent id in citations: doi:10.21468/SciPostPhys.4.6.041  doi:10.3204/PUBDB-2018-03277

Report No.: CERN-TH-2017-272; DESY-17-232; arXiv:1712.07489

Abstract: The putative discrepancies between observations of the small scale galactic structure and the predictions of collisionless cold dark matter may be resolved if dark matter possesses sizable self-interactions. The coupling of dark matter to a light force mediator can ensure sufficiently large self-interactions, reproduce the observed relic abundance via freeze-out and satisfy constraints from cluster mergers and direct detection. However, strong bounds on such scenarios still arise from indirect detection, particularly from the CMB and $\gamma$-rays observations. As a simple way to alleviate this tension, we consider the possibility of dark matter possessing a particle-antiparticle asymmetry. First, we point out that, contrary to the common perception, significant residual annihilations occur even for highly asymmetric dark matter coupled to light force carriers. We compute the indirect detection signals and corresponding constraints from the CMB, $\gamma$-ray, neutrino and antiproton searches. On this basis, we then identify the parameter space where the dark matter self-interactions are significant while evading the above bounds. While the direct detection constraints are not suppressed by the asymmetry, we show that they do not yet rule out this scenario, but provide a method for confirming it.

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF3-611) (POF3-611)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2018

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint/Report Baldes, I. (Corresponding author)DESY* ; Cirelli, M. ; Panci, P. ; Petraki, K. ; Sala, F.DESY* ; Taoso, M.
Asymmetric Dark Matter: Residual Annihilations and Self-Interactions
[10.3204/PUBDB-2017-13972]     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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