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Dynamical friction in ultralight dark matter: Plummer sphere perspective
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Dynamical friction in ultralight dark matter: Plummer sphere perspective
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In models of dark matter composed of feebly interacting ultralight bosons in the state of Bose-Einstein condensate, the dynamical friction force acting on circularly moving globular clusters modelled as Plummer spheres is determined. Analytic expressions for both radial and tangential components of the dynamical friction force are given. We reveal that the dynamical friction force for the Plummer sphere deviates from that for a point probe of the same mass for a significantly large ratio of the Plummer sphere radius to its orbital radius, as well as for large values of the Mach number.
Forward citations
Cited by 2 Pith papers
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Damping of dynamical friction force in self-interacting ultralight dark matter and Fornax timing problem
Including a damping term in the ultralight-dark-matter Gross-Pitaevskii equations reduces dynamical friction enough to allow the Fornax globular cluster GC3 to survive to 12 Gyr for certain boson masses and initial orbits.
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Vortex State of Ultralight Dark Matter and the Fornax Timing Problem
A vortex state of ultralight dark matter suppresses dynamical friction for co-rotating globular clusters, potentially resolving the Fornax timing problem.
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