Implications for dark matter direct detection in the presence of LIGO-motivated primordial black holes
Hertzberg, M. P., Schiappacasse, E. D., & Yanagida, T. T. (2020). Implications for dark matter direct detection in the presence of LIGO-motivated primordial black holes. Physics Letters B, 807, Article 135566. https://doi.org/10.1016/j.physletb.2020.135566
Published inPhysics Letters B
© 2020 The Authors. Published by Elsevier B.V.
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.
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Additional information about fundingT. T. Y. is supported in part by the China Grant for Talent Scientific Start-Up Project and the JSPS Grant-in-Aid for Scientific Research No. 16H02176, No. 17H02878, and No. 19H05810 and by World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan. T. T. Y. thanks to Hamamatsu Photonics. M. P. H. is supported in part by National Science Foundation grant PHY-1720332. E. D. S. thanks to Martin Stref for useful discussions. ...
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