Self-interacting Dark Matter Without Direct Detection Constraints

Abstract

We explore the self-interacting dark matter scenario in a simple dark sector model where the dark matter interacts through a dark photon. Splitting a Dirac fermion dark matter into two levels using a small Majorana mass can evade strong direct detection constraints on the kinetic mixing between the dark and normal photons, thus allowing the dark sector to be more visible at high intensity and/or high energy experiments. It is pointed out that such a mass splitting has a strong impact on the dark matter self-interaction strength. We derive the new parameter space of a pseudo-Dirac self-interacting dark matter. Interestingly, with increasing mass splitting, a weak scale dark matter mass window survives that could be probed by the LHC and future colliders.

11 pages, 7 figures. References and a general discussion of indirect detection constraint added. Published version

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Cited by in corpus (4)

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• Astrophysical probes of inelastic dark matter with a light mediator
• New results by low momentum approximation from relativistic quantum mechanics equations and suggestion of experiments