Kavli Affiliate: Misao Sasaki
| First 5 Authors: Xinpeng Wang, Xinpeng Wang, , ,
| Summary:
Dark matter fermions interacting via attractive fifth forces mediated by a
light mediator can form dark matter halos in the very early universe. We show
that bound systems composed of these halos are capable of generating
gravitational wave (GW) signals detectable today, even when the individual
halos are very light. The Yukawa force dominates the dynamics of these halo
binaries, rather than gravity. As a result, large GW signals can be produced at
initially extremely high frequencies, which are then redshifted to frequency
bands accessible to current or future GW observatories. In addition, the
resulting GW signals carry distinctive features that enable future observations
to distinguish them from conventional ones. Notably, even if only a tiny
fraction of dark matter experiences strong fifth-force interactions, such
effects provide a new avenue to discover self-interacting dark matter through
GW observations.
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