Measuring gravitational wave memory with LISA
Inchauspé, Henri (Universität Heidelberg. Institut für Theoretische Physik)
Gasparotto, Silvia (Universitat Autònoma de Barcelona. Departament de Física)
Blas Temiño, Diego (Institut de Física d'Altes Energies)
Heisenberg, Lavinia (Universität Heidelberg. Institut für Theoretische Physik)
Zosso, Jann (University of Bern. Institute for Theoretical Physics. Albert Einstein Center)
Tiwari, Shubhanshu (Universität Zürich. Physik-Institut)

Data:	2025
Resum:	Gravitational wave (GW) astronomy has revolutionized our capacity to explore nature. The next generation of observatories, among which the spaceborne detector Laser Interferometer Space Antenna (LISA) is expected to yield orders of magnitude of signal-to-noise-ratio improvement and reach fainter and novel features of general relativity. Among them, an exciting possibility is the detection of GW memory. Interpreted as a permanent deformation of the background spacetime after a GW perturbation has passed through the detector, GW memory offers a novel avenue to proof-test general relativity, access the nonlinear nature of gravity, and provide complementary information to better characterize the GW source. Previous studies have shown that GW memory detection from individual mergers of massive black hole binaries is expected with LISA. However, these works have not simulated the proper time-domain response of the detector to the GW memory. This work is filling this gap and presents the detection prospects of LISA regarding GW memory and the expected signature of GW memory on the data streams using the most up-to-date LISA consortium simulations of the response. We focus on the GW memory of massive black hole binary mergers and use state-of-the-art population models to assess the likelihood of detecting the GW memory within the LISA lifetime. We conclude that GW memory will be a key feature of several events detected by LISA and will help to exploit the scientific potential of the mission fully.
Ajuts:	Agencia Estatal de Investigación PID2020-115845GB-I00 Agència de Gestió d'Ajuts Universitaris i de Recerca 2022/FI-SDUR Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-00649 European Commission 801781
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Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Publicat a:	Physical Review D, Vol. 111, Issue 4 (February 2025) , art. 44044, ISSN 2470-0029

DOI: 10.1103/PhysRevD.111.044044

Postprint 20 p, 6.6 MB

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