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arXiv · 2409.02624

Gyroscopic Gravitational Memory from quasi-circular binary systems

Guillaume Faye·Ali Seraj
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Abstract

Gravitational waves cause freely falling spinning objects to precess, resulting in a net orientation change called gyroscopic memory. In this paper, we will consider isolated gravitational sources in the post-Newtonian framework and compute the gyroscopic precession and memory at leading post-Newtonian (PN) orders. We compare two competing contributions: the spin memory and the nonlinear helicity flux. At the level of the precession rate, the former is a 2PN oscillatory effect, while the latter is a 4PN adiabatic effect. However, the gyroscopic memory involves a time integration, which enhances subleading adiabatic effects by the fifth power of the velocity of light, leading to a 1.5PN memory effect. We explicitly compute the leading effects for a quasi-circular binary system and obtain the angular dependence of the memory on the celestial sphere.

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Guillaume Faye, Ali Seraj. 2024-09-04. Gyroscopic Gravitational Memory from quasi-circular binary systems. https://doi.org/10.1088/1361-6382/ada339

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