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

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.
Authors:
;  [1] ;  [2]
  1. SISSA, via Bonomea 265, Trieste, I-34136 (Italy)
  2. INFN, sezione di Trieste, Trieste, I-34136 (Italy)
Publication Date:
OSTI Identifier:
22373642
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 04; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANNIHILATION; ASTROPHYSICS; BUBBLES; DENSITY; FERMIONS; GAMMA RADIATION; GEV RANGE 01-10; HIGGS MODEL; NONLUMINOUS MATTER; PHOTONS; STANDARD MODEL