Relaxation in a Fuzzy Dark Matter Halo. II. Selfconsistent kinetic equations
Abstract
Fuzzy dark matter (FDM) is composed of ultralight bosons having a de Broglie wavelength that is comparable to the size of the stellar component of galaxies at typical galactic velocities. FDM behaves like cold dark matter on large scales. However, on the scale of the de Broglie wavelength, an FDM halo exhibits density fluctuations that lead to relaxation, a process similar to the twobody relaxation that occurs in classical gravitational Nbody systems and is described by the FokkerPlanck equation. We derive the FDM analog of that kinetic equation, and solve it to find the evolution of the velocity distribution in a spatially homogeneous FDM halo. We also determine the dielectric function and the dispersion relation for linear waves in an FDM halo.
 Publication:

arXiv eprints
 Pub Date:
 October 2020
 arXiv:
 arXiv:2010.10212
 Bibcode:
 2020arXiv201010212B
 Keywords:

 Astrophysics  Astrophysics of Galaxies
 EPrint:
 22 pages, 4 figures, submitted to AAS