Direct detection signatures of self-interacting dark matter with a light mediator

被引：51

作者：

Del Nobile, Eugenio ^{[1
]}

Kaplinghat, Manoj ^{[2
]}

Yu, Hai-Bo ^{[3
]}

机构：

[1] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[2] Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 92507 USA

[3] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2015年 / 10期

基金：

美国国家科学基金会;

关键词：

dark matter theory; dark matter experiments; COSMOLOGICAL SIMULATIONS; MODEL;

D O I：

10.1088/1475-7516/2015/10/055

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Self-interacting dark matter (SIDM) is a simple and well-motivated scenario that could explain long-standing puzzles in structure formation on small scales. If the required self-interaction arises through a light mediator (with mass similar to 10 MeV) in the dark sector, this new particle must be unstable to avoid overclosing the universe. The decay of the light mediator could happen due to a weak coupling of the hidden and visible sectors, providing new signatures for direct detection experiments. The SIDM nuclear recoil spectrum is more peaked towards low energies compared to the usual case of contact interactions, because the mediator mass is comparable to the momentum transfer of nuclear recoils. We show that the SIDM signal could be distinguished from that of DM particles with contact interactions by considering the time-average energy spectrum in experiments employing different target materials, or the average and modulated spectra in a single experiment. Using current limits from LUX and SuperCDMS, we also derive strong bounds on the mixing parameter between hidden and visible sector.

引用

页数：23

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