Journal
PHYSICS LETTERS B
Volume 773, Issue -, Pages 219-224Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2017.08.043
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Funding
- DFG [RO 2516/5-1]
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There exists a class of ultralight Dark Matter (DM) models which could give rise to a Bose-Einstein condensate (BEC) in the early universe and behave as a single coherent wave instead of individual particles in galaxies. We show that a generic BEC-DM halo intervening along the line of sight of a gravitational wave (GW) signal could induce an observable change in the speed of GWs, with the effective refractive index depending only on the mass and self-interaction of the constituent DM particles and the GW frequency. Hence, we propose to use the deviation in the speed of GWs as a new probe of the BEC-DM parameter space. With a multi-messenger approach to GW astronomy and/or with extended sensitivity to lower GW frequencies, the entire BEC-DM parameter space can be effectively probed by our new method in the near future. (C) 2017 The Authors. Published by Elsevier B.V.
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