Upper Limit on the Dissipation of Gravitational Waves in Gravitationally Bound Systems
arXiv:2001.01730 · doi:10.3847/2041-8213/ab72ab
Abstract
It is shown that a gravitationally bound system with a one-dimensional velocity dispersion sigma can at most dissipate a fraction ~36(sigma/c)^3 of the gravitational wave energy propagating through it, even if their dynamical time is shorter than the wave period. The limit is saturated for particles with a mean-free-path equal to the size of the system, such as hot protons in galaxy clusters, strongly-interacting dark matter particles in halos, or massive black holes in clusters. For such systems with random motions and no resonances, the dissipated fraction, <10^{-6}, does not degrade the use of gravitational waves as cosmological probes. At high wave frequencies, the dissipated fraction is additionally suppressed by the square of the ratio between the collision frequency and the wave frequency. The electromagnetic counterparts that result from the dissipation are too faint to be detectable at cosmological distances.
arXiv comment5 pages, accepted for publication in The Astrophysical Journal Letters
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