Damping of long wavelength gravitational waves by the intergalactic medium

Author:

Lieu RichardORCID,Lackeos KristenORCID,Zhang Bing

Abstract

Abstract The problem of radiation by the charged particles of the intergalactic medium (IGM) when a passing gravitational wave (GW) accelerates them is investigated. The largest acceleration (taking a charge from rest to a maximum speed which remains non-relativistic in the rest frame of the unperturbed spacetime) is found to be limited by the curvature of a propagating spherical gravitational wavefront. Interesting physics arises from the ensuing emission of radiation into the warm hot IGM, which to lowest order is a fully ionized hydrogen plasma with a frozen-in magnetic field B. It is found that for a vast majority of propagation directions, the radiation can penetrate the plasma at frequencies below the plasma frequency ω p, provided ω < ω b, where ω b = eB/m e satisfies ω b < ω p for typical IGM conditions. Moreover, the refractive index under such a scenario is n ≫ 1, resulting in an enhanced radiative dissipation of GW energy (relative to the vacuum scenario), which is more severe for electrons if both charge species are in thermal equilibrium and accelerated in the same way. The emission by the electrons then prevails, and is further amplified by coherent addition of amplitudes within the size one wavelength. The conversion of GWs of λ≳ 5 × 1013 cm to electromagnetic waves means such GWs can only propagate a distance ≲1 Gpc before being significantly damped by an IGM B field of ∼10−8 G. The low-frequency GWs targeted by pulsar-timing-arrays will not survive unless the IGM magnetic field is much lower than expected. The mHz frequency GW inspirals targeted by future space based detectors such as the Laser Interferometer Space Antenna remain intact and can be detected.

Publisher

IOP Publishing

Subject

Physics and Astronomy (miscellaneous)

Cited by 3 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. The second data release from the European Pulsar Timing Array;Astronomy & Astrophysics;2024-05

2. Gertsenshtein–Zel’dovich effect: a plausible explanation for fast radio bursts?;Monthly Notices of the Royal Astronomical Society;2023-11-16

3. Fast radio bursts signal high-frequency gravitational waves;International Journal of Modern Physics D;2023-07-25

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