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Journal Article

Multiparameter tests of general relativity using multiband gravitational-wave observations


Kastha,  Shilpa
Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Gupta, A., Datta, S., Kastha, S., Borhanian, S., Arun, K. G., & Sathyaprakash, B. S. (2020). Multiparameter tests of general relativity using multiband gravitational-wave observations. Physical Review Letters, 125(20): 201101. doi:10.1103/PhysRevLett.125.201101.

Cite as: http://hdl.handle.net/21.11116/0000-0006-7C32-7
In this Letter we show that multiband observations of stellar-mass binary black holes by the next generation of ground-based observatories (3G) and the space-based Laser Interferometer Space Antenna (LISA) would facilitate a comprehensive test of general relativity by simultaneously measuring all the post-Newtonian (PN) coefficients. Multiband observations would measure most of the known PN phasing coefficients to an accuracy below a few percent---two orders-of-magnitude better than the best bounds achievable from even `golden' binaries in the 3G or LISA bands. Such multiparameter bounds would play a pivotal role in constraining the parameter space of modified theories of gravity beyond general relativity.