Dark Matter and Stars: Multi-Messenger Probes of Dark Matter and Modified Gravity

Tight constraints on Einstein-dilation-Gauss-Bonnet gravity from GW190412 and GW190814

5 May 2023, 12:05

15m

Centro de Congressos (Center for Astrophysics and Gravitation, Instituto Superior Técnico, University of Lisbon)

Speaker

Dr Hai-Tian Wang (Peking University)

Description

Gravitational-wave (GW) data can be used to test general relativity in the highly nonlinear and strong field regime. Modified gravity theories such as Einstein-dilation-Gauss-Bonnet and dynamical Chern-Simons can be tested with the additional GW signals detected in the first half of the third observing run of Advanced LIGO/Virgo. Specifically, we analyze gravitational-wave data of GW190412 and GW190814 to place constraints on the parameters of these two theories. Our results indicate that dynamical Chern-Simons gravity remains unconstrained. For Einstein-dilation-Gauss-Bonnet gravity, we find $\sqrt{{\alpha }_{\mathrm{E}\mathrm{d}\mathrm{G}\mathrm{B}}}\le 0.40\mathrm{k}\mathrm{m}$ when considering GW190814 data, assuming it is a black hole binary. Such a constraint is improved by a factor of approximately $10$ in comparison to that set by the first Gravitational-Wave Transient Catalog events.

Presentation materials

GW190814_EdGB.pdf