Fermi Bubbles under Dark Matter Scrutiny Part II: Particle Physics Analysis

Abstract

The analysis of the gamma-ray photons collected by the Fermi Large Area Telescope reveals, after removal of astrophysical background, the existence of an excess towards the Galactic center. This excess peaks around few GeV, and its origin is compatible with the gamma-ray flux originating from Dark Matter annihilation. In this work we take a closer look on this interpretation; we investigate which kind of Dark Matter, and which type of interactions with the Standard Model fields are able to reproduce the observed signal. The structure of the paper is twofold. In the first part, we follow an effective field theory approach considering both fermionic and scalar Dark Matter. The computation of the relic density, the constraint imposed from the null result of direct searches, and the reliability of the effective field theory description allow us to single out only two viable dim-6 operators in the case of fermionic Dark Matter. In the second part, we analyze some concrete models. In particular, we find that the scalar Higgs portal can provide a simple, concrete and realistic scenario able to explain the GeV excess under scrutiny.

39 pages, 9 figures; note and refs. added; version accepted by JCAP

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Cited by in corpus (30)

• A Tale of Tails: Dark Matter Interpretations of the Fermi GeV Excess in Light of Background Model Systematics
• Simplified Dark Matter Models for the Galactic Center Gamma-Ray Excess
• Gravitational probes of dark matter physics
• Hidden On-Shell Mediators for the Galactic Center Gamma-Ray Excess
• Millisecond pulsars and the Galactic Center gamma-ray excess: the importance of luminosity function and secondary emission
• Flavored Dark Matter and the Galactic Center Gamma-Ray Excess
• Hidden Sector Dark Matter Models for the Galactic Center Gamma-Ray Excess
• NMSSM Interpretation of the Galactic Center Excess
• Challenges in Explaining the Galactic Center Gamma-Ray Excess with Millisecond Pulsars
• The Galactic Center Excess from the Bottom Up
• Antiproton constraints on the GeV gamma-ray excess: a comprehensive analysis
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• Neutrino Events at IceCube and the Fermi Bubbles
• Towards a realistic astrophysical interpretation of the gamma-ray Galactic center excess
• A description of the Galactic Center excess in the Minimal Supersymmetric Standard Model
• Composite Dark Matter and LHC Interplay
• Multimediator models for the galactic center gamma ray excess
• SUSY Implications from WIMP Annihilation into Scalars at the Galactic Centre
• The $\text{Fermi}$-LAT gamma-ray excess at the Galactic Center in the singlet-doublet fermion dark matter model
• Galactic Center gamma-ray excess from two-Higgs-doublet-portal dark matter
• Explaining the DAMPE data with scalar dark matter and gauged $U(1{)}_{L_e-L_{\mu }}$ interaction
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• Confronting Galactic center and dwarf spheroidal gamma-ray observations with cascade annihilation models
• Pseudoscalar Portal Dark Matter and New Signatures of Vector-like Fermions
• Molecular Clouds as the Origin of the Fermi Gamma-Ray GeV-Excess
• Wavelet-Based Techniques for the Gamma-Ray Sky
• A Closer Look at CP-Violating Higgs Portal Dark Matter as a Candidate for the GCE
• Consistency test of the AMS-02 antiproton excess with direct detection data based on the effective field theory approach