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arXiv · 2007.12206

Persistent Astrometric Deflections from Gravitational-Wave Memory

Dustin R. Madison
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Abstract

Gravitational waves (GWs) produce small distortions in the observable distribution of stars in the sky. We describe the characteristic pattern of astrometric deflections created by a specific gravitational waveform called a burst with memory. Memory is a permanent, residual distortion of space left in the wake of GWs. We demonstrate that the astrometric effects of GW memory are qualitatively distinct from those of more broadly considered, oscillatory GWs---distinct in ways with potentially far-reaching observational implications. We discuss some such implications pertaining to the random-walk development of memory-induced deflection signatures over cosmological time spans and how those may influence observations of the cosmic microwave background.

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Dustin R. Madison. 2020-07-23. Persistent Astrometric Deflections from Gravitational-Wave Memory. https://doi.org/10.1103/physrevlett.125.041101

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