Nov 3 – 5, 2025
ETH, Zurich
Europe/Zurich timezone

Gravitational memory effect and asymptotic symmetries in de Sitter space-times

Nov 3, 2025, 3:05 PM
10m
E51, HIT building (ETH, Zurich)

E51, HIT building

ETH, Zurich

Stefano-Franscini-Platz 5, 8093 Zürich
Lightning talk Lightning talks

Speaker

Sk Jahanur Hoque (Université Libre de Bruxelles, Belgium)

Description

Gravitational memory effect is the permanent displacement in the relative separation between freely falling particles resulting from the passage of gravitational wave train. We obtain a closed form expression for the linearized perturbation upto quadrupolar order around de Sitter space-times generated by spatially compact sources. We demonstrate that such a source causes a displacement memory effect close to future infinity. We also discuss a correspondence between memory effect and asymptotic symmetries of de Sitter.

Authors

Geoffrey Compère (Universite Libre de Bruxelles) Sk Jahanur Hoque (Université Libre de Bruxelles, Belgium) Emine Seyma Kutluk (Scoula Normale Superiore, Italy)

Presentation materials