Constraints on Einstein-dilation-Gauss-Bonnet gravity and electric charge of compact binary systems from GW230529

TL;DR

This paper reanalyzes GW230529 to set new bounds on Einstein-dilation-Gauss-Bonnet gravity and the electric charge of black holes, improving constraints over previous observations.

Contribution

It provides the first bounds on EdGB gravity and black hole charge from the GW230529 event, including high order corrections for tighter constraints.

Findings

Bounds on EdGB parameter improved to $oxed{0.260}$ km.

Charge-to-mass ratio constrained to $oxed{0.024}$.

Constraints are more stringent than previous single-event analyses.

Abstract

In this work, we study the implications of GW230529 on gravity theories and the charge of black holes. The GW230529, which was initially released in O4a, is most likely neutron star-black hole (NSBH) mergers. We reanalyze the data from the GW230529 event to obtain bounds on the Einstein-dilation-Gauss-Bonnet (EdGB) gravity parameter $\sqrt{\alpha_{\rm EdGB}}$ and the electric charge of compact binary systems. The event places a $90\%$ credible upper bounds on $\sqrt{\alpha_{\rm EdGB}}$ of $\lesssim 0.298$ km. After including high order corrections of EdGB gravity, the bounds improve to $\sqrt{\alpha_{\rm EdGB}} \lesssim 0.260$ km. Analyses of GW230529 also yield a $90\%$ credible upper bounds on the combination of charge-to-mass ratio of the binary components $\zeta \lesssim 0.024$. The constraints are more stringent than those derived from previously observed single gravitational wave merger event.