Dynamical friction in a Fuzzy Dark Matter universe

Lancaster, Lachlan; Giovanetti, Cara; Mocz, Philip; Kahn, Yonatan; Lisanti, Mariangela; Spergel, David N.

doi:10.1088/1475-7516/2020/01/001

Title: Dynamical friction in a Fuzzy Dark Matter universe

Journal Article · 01 January 2020 · Journal of Cosmology and Astroparticle Physics

DOI: https://doi.org/10.1088/1475-7516/2020/01/001 · OSTI ID:1801795

Lancaster, Lachlan ^[1]; Giovanetti, Cara ^[2]; Mocz, Philip ^[3]; Kahn, Yonatan ^[4]; Lisanti, Mariangela ^[2]; Spergel, David N. ^[5]

Princeton Univ., NJ (United States). Dept. of Astrophysical Sciences; OSTI
Princeton Univ., NJ (United States). Dept. of Physics
Princeton Univ., NJ (United States). Dept. of Astrophysical Sciences
Univ. of Chicago, IL (United States). Kavli Inst. for Cosmological Physics
Princeton Univ., NJ (United States). Dept. of Astrophysical Sciences; Princeton Univ., NJ (United States). Dept. of Physics; Flatiron Inst., New York, NY (United States). Center for Computational Astrophysics

We present an in-depth exploration of the phenomenon of dynamical friction in a universe where the dark matter is composed entirely of so-called Fuzzy Dark Matter (FDM), ultralight bosons of mass m ~ O(10^-22) eV. We review the classical treatment of dynamical friction before presenting analytic results in the case of FDM for point masses, extended mass distributions, and FDM backgrounds with finite velocity dispersion. We then test these results against a large suite of fully non-linear simulations that allow us to assess the regime of applicability of the analytic results. We apply these results to a variety of astrophysical problems of interest, including infalling satellites in a galactic dark matter background, and determine that (1) for FDM masses m & 10^-21 eV c^-2 , the timing problem of the Fornax dwarf spheroidal’s globular clusters is no longer solved and (2) the effects of FDM on the process of dynamical friction for satellites of total mass M and relative velocity vrel should require detailed numerical simulations for M/109 M m/10^-22 eV 100 km s^-1/vrel ~ 1, parameters which would lie outside the validated range of applicability of any currently developed analytic theory, due to transient wave structures in the time-dependent regi

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Research Organization:: Princeton Univ., NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0007968

OSTI ID:: 1801795

Journal Information:: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 01 Vol. 2020; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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