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Secluded WIMPs, Dark QED with Massive Photons, and the Galactic Center Gamma-Ray ExcessWe discuss a particular secluded WIMP dark matter model consisting of neutral fermions as the dark matter candidate and a Proca-Wentzel (PW) field as a mediator. In the model that we consider here, dark matter WIMPs interact with standard model (SM) particles only through the PW field of approximately MeV-multi-GeV mass particles. The interactions occur via a U(1)' mediator, V'(sub mu), which couples to the SM by kinetic mixing with U(1) hypercharge bosons, B'(sub mu). One important difference between our model and other such models in the literature is the absence of an extra singlet scalar, so that the parameter with dimension of mass M(sup 2, sub V) is not related to a spontaneous symmetry breaking. This QED based model is also renormalizable. The mass scale of the mediator and the absence of the singlet scalar can lead to interesting astrophysical signatures. The dominant annihilation channels are different from those usually considered in previous work. We show that the GeV energy gamma-ray excess in the galactic center region, as derived from Fermi-LAT Gamma-ray Space Telescope data, can be attributed to such secluded dark matter WIMPs, given parameters of the model that are consistent with both the cosmological dark matter density and the upper limits on WIMP spin-independent elastic scattering. Secluded WIMP models are also consistent with suggested upper limits on a DM contribution to the cosmic-ray antiproton flux.
Document ID
20170002742
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Fortes, E. C. F. S.
(Universidade Estadual de Paulista Sao Paulo, Brazil)
Pleitez, V.
(Universidade Estadual de Paulista Sao Paulo, Brazil)
Stecker, F. W.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
March 31, 2017
Publication Date
October 30, 2015
Publication Information
Publication: Astroparticle Physics
Publisher: Elsevier
Volume: 74
ISSN: 0927-6505
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN40755
Funding Number(s)
CONTRACT_GRANT: FAPESP 14/05505-6
CONTRACT_GRANT: FAPESP 11/219945-8
Distribution Limits
Public
Copyright
Other
Keywords
Gamma-Rays
Antiprotons
Secluded dark matter

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