Dark Matter, Shared Asymmetries, and Galactic Gamma Ray Signals

Abstract

We introduce a novel dark matter scenario where the visible sector and the dark sector share a common asymmetry. The two sectors are connected through an unstable mediator with baryon number one, allowing the standard model baryon asymmetry to be shared with dark matter via semi-annihilation. The present-day abundance of dark matter is then set by thermal freeze-out of this semi-annihilation process, yielding an asymmetric version of the WIMP miracle as well as promising signals for indirect detection experiments. As a proof of concept, we find a viable region of parameter space consistent with the observed Fermi excess of GeV gamma rays from the galactic center.

20+12 pages, 11 figures, 1 table; v2: references added, minor corrections to CMB bounds; v3: footnotes added for clarification, updated appendix A, conclusions unchanged, version to appear in JCAP

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Cited by in corpus (14)

• The Gamma-Ray Luminosity Function of Millisecond Pulsars and Implications for the GeV Excess
• The Gamma-Ray Pulsar Population of Globular Clusters: Implications for the GeV Excess
• Low Mass X-Ray Binaries in the Inner Galaxy: Implications for Millisecond Pulsars and the GeV Excess
• Model-independent analysis of the DAMPE excess
• Millisecond Pulsars, TeV Halos, and Implications For The Galactic Center Gamma-Ray Excess
• Asymmetric Dark Matter Models in SO(10)
• Evidence of TeV Halos Around Millisecond Pulsars
• Dark Matter Bound State Formation in Fermionic $Z_2$ DM model with Light Dark Photon and Dark Higgs Boson
• A Systematic Study of Hidden Sector Dark Matter: Application to the Gamma-Ray and Antiproton Excesses
• WIMP Cogenesis for Asymmetric Dark Matter and the Baryon Asymmetry
• Sharing but not Caring: Dark Matter and the Baryon Asymmetry of the Universe
• The Galactic Center Excess from Z3 Scalar Semi-Annihilations
• A Systematic Effective Operator Analysis of Semi-Annihilating Dark Matter
• Dark matter properties implied by gamma ray interstellar emission models