Gravitational wave as probe of superfluid dark matter
Abstract
In recent years, superfluid dark matter (SfDM) has become a competitive model of emergent modified Newtonian dynamics (MOND) scenario: MOND phenomenons naturally emerge as a derived concept due to an extra force mediated between baryons by phonons as a result of axionlike particles condensed as superfluid at galactic scales; Beyond galactic scales, these axionlike particles behave as normal fluid without phonon-mediated MOND-like force between baryons, therefore SfDM also maintains the usual success of CDM at cosmological scales. In this paper, we use gravitational waves (GWs) to probe the relevant parameter space of SfDM. GWs through Bose-Einstein condensate (BEC) could propagate with a speed slightly deviation from the speed-of-light due to the change in the effective refractive index, which depends on the SfDM parameters and GW-source properties. We find that Five hundred meter Aperture Spherical Telescope (FAST), Square Kilometre Array (SKA) and International Pulsar Timing Array (IPTA) are the most promising means as GW probe of relevant parameter space of SfDM. Future space-based GW detectors are also capable of probing SfDM if a multimessenger approach is adopted.
Keywords
Cite
@article{arxiv.1710.02425,
title = {Gravitational wave as probe of superfluid dark matter},
author = {Rong-Gen Cai and Tong-Bo Liu and Shao-Jiang Wang},
journal= {arXiv preprint arXiv:1710.02425},
year = {2018}
}
Comments
v1, 10 pages, 2 figures, two columns; v2, 12 pages, 2 figures, two columns, references are added, a summary for GW velocity constraints is added, a discussion on Shapiro time delay is added; v3, 13 pages, 2 figures, two columns, final version to match the published version