Non-Kerr constraints using binary black hole inspirals considering phase modifications up to 4 PN order
Year: 2024
Type: article
Abstract: The gravitational field around an astrophysical black hole (BH) is thought to be described by the Kerr spacetime, which is a solution of the Einstein equation. Signatures of binary black hole (BBH) coalescence in gravitational waves (GW) follow the Kerr spacetime as the theoretical foundation. Hence, any possible deviations from the Kerr spacetime around BHs serve as a test of the nature of gravity in the strong-field regime and of the predictions of General Relativity. In our study, we perform a theory-agnostic test of the Kerr hypothesis using BBH inspirals from the third Gravitational-wave Transient Catalog (GWTC-3). Considering the Johannsen metric, we compute the leading-order deviation to the emitted GW in the frequency domain. Our results provide constraints on two deformation parameters ( $$\alpha _{13}$$ α 13 and $$\epsilon _3$$ ϵ 3 ) and demonstrate the degeneracy between these two non-Kerr parameters.
Source: The European Physical Journal C
Authors: Debtroy Das, Swarnim Shashank, Cosimo Bambi
Institutions: Fudan University, New Uzbekistan University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Funders: National Science Foundation, Natural Science Foundation of Shanghai, National Research Foundation, Ministry of Education, Culture, Sports, Science and Technology, National Natural Science Foundation of China, Academia Sinica, China Scholarship Council, Centre National de la Recherche Scientifique, Istituto Nazionale di Fisica Nucleare, Ministry of Science and ICT, South Korea, National Science and Technology Council, Science and Technology Facilities Council, Japan Society for the Promotion of Science
OpenAlex ID: W4404860420