Implications for dark matter direct detection in the presence of LIGO-motivated primordial black holes

Physics Letters B

Tsutomu T. Yanagida¹  Enrico D. Schiappacasse²  Mark P. Hertzberg³ 

[1] Helsinki Institute of Physics, P.O. Box 64, FIN-00014 University of Helsinki, Finland;Department of Physics, P.O.Box 35 (YFL), FIN-40014 University of Jyväskylä, Finland;Institute of Cosmology, Department of Physics and Astronomy, Tufts University, Medford, MA 02155, USA;

关键词: Axion dark matter;    Primordial black holes;    Dark mini-halos;    Dark matter direct detection;    LIGO-Virgo collaboration;   

DOI  :  

来源: DOAJ

【 摘 要 】

We discuss formation of dark matter (DM) mini-halos around primordial black holes (PBHs) and its implication on DM direct detection experiments, including axion searches. Motivated by LIGO observations, we consider fDM≃0.01 as the fraction of DM in PBHs with masses 10M⊙−70M⊙. In this case, we expect the presence of dressed PBHs after Milky Way halo formation with mini-halo masses peaked around Mhalo∼(50−55)MPBH. We analyze the effect of tidal forces acting on dressed PBHs within the Milky Way galaxy. In the solar neighborhood, the mini-halos are resistant against tidal disruption from the mean-field potential of the galaxy and encounters with stars, but they undergo a small level of disruption caused by disk shocking. The presence of mini-halos around LIGO-motivated PBHs today could reduce by half the local dark matter background. High-resolution simulations are encouraged. If the proposed scenario is realized, chances of direct detection of DM would decrease.

【 授权许可】

Unknown