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Geodesic congruences, impulsive gravitational waves and gravitational memory

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arxiv 1808.04886 v3 pith:HNJJWARR submitted 2018-08-14 hep-th gr-qc

classification hep-thgr-qc
keywords gravitationalcongruencegeodesicimpulsivememorywavewavesapproach
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In this paper we introduce a new approach to the study of the effects that an impulsive wave, containing a mixture of material sources and gravitational waves, has on a geodesic congruence that traverses it. We find that the effect of the wave on the congruence is a discontinuity in the B-tensor of the congruence. Our results thus provide a detector independent and covariant characterization of gravitational memory.

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  1. Displacement memory and B-memory in generalised Ellis-Bronnikov wormholes

    gr-qc 2025-02 conditional novelty 5.0 of 10

    In a generalized Ellis-Bronnikov wormhole, a gravitational wave pulse leaves lasting changes in geodesic separation and congruence expansion, with the effect size set by the wormhole's throat radius and steepness.

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