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Journal Article

MeV Dark Matter Complementarity and the Dark Photon Portal


Lindner,  Manfred
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;


Rodejohann,  Werner
Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Dutra, M., Lindner, M., Profumo, S., Queiroz, F. S., Rodejohann, W., & Siqueira, C. (2018). MeV Dark Matter Complementarity and the Dark Photon Portal. Journal of Cosmology and Astroparticle Physics, 2018(03): 037. doi:10.1088/1475-7516/2018/03/037.

Cite as: http://hdl.handle.net/21.11116/0000-0003-3E16-0
We discuss the phenomenology of an MeV-scale Dirac fermion coupled to the Standard Model through a dark photon with kinetic mixing with the electromagnetic field. We compute the dark matter relic density and explore the interplay of direct detection and accelerator searches for dark photons. We show that precise measurements of the temperature and polarization power spectra of the Cosmic Microwave Background Radiation lead to stringent constraints, leaving a small window for the thermal production of this MeV dark matter candidate. The forthcoming MeV gamma-ray telescope e-ASTROGAM will offer important and complementary opportunities to discover dark matter particles with masses below 10 MeV. Lastly, we discuss how a late-time inflation episode and freeze-in production could conspire to yield the correct relic density while being consistent with existing and future constraints.