Light dark matter: Models and constraints

Creators: Knapen, Simon; Lin, Tongyan; Zurek, Kathryn M.

Abstract

We study the direct detection prospects for a representative set of simplified models of sub-GeV dark matter (DM), accounting for existing terrestrial, astrophysical and cosmological constraints. We focus on dark matter lighter than an MeV, where these constraints are most stringent, and find three scenarios with accessible direct detection cross sections: (i) DM interacting via an ultralight kinetically mixed dark photon, (ii) a DM subcomponent interacting with nucleons or electrons through a light scalar or vector mediator, and (iii) DM coupled with nucleons via a mediator heavier than ∼100 keV.

Additional Information

© 2017 American Physical Society. (Received 30 October 2017; published 26 December 2017) We thank Claudia Frugiuele, Dan Green, Ed Hardy, Rob Lasenby, Zoltan Ligeti, Sam McDermott, Michele Papucci, Surjeet Rajendran, Sean Tulin, Haibo Yu, and Yiming Zhong for useful discussions. We also thank Robert Lasenby for discussions leading to an updated SN1987a bound for the leptophilic model, and Surjeet Rajendran and Dan Green for discussions leading to a numerical correction in the BBN constraints for the B-L model. The authors are supported by the DOE under Contract No. DE-AC02-05CH11231. T. L. is further supported by NSF Grant No. PHY-1316783. We thank the Aspen Center for Physics, supported by the NSF Grant No. PHY-1066293, for hospitality while parts of this work were completed.

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Published - PhysRevD.96.115021.pdf

Submitted - 1709.07882.pdf

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