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arXiv · 2210.09235

Nonlinear studies of binary black hole mergers in Einstein-scalar-Gauss-Bonnet gravity

Maxence Corman·Justin L. Ripley·William E. East
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Abstract

We study the nonlinear dynamics of binary black hole systems with scalar charge by numerically evolving the full equations of motion for shift-symmetric Einstein scalar Gauss-Bonnet gravity. We consider quasi-circular binaries with different mass-ratios, varying the Gauss-Bonnet coupling and quantifying its impact on the emitted scalar and gravitational waves. We compare our numerical results to post-Newtonian calculations of the radiation emitted during the inspiral. We demonstrate the accuracy of the leading-order terms in post-Newtonian theory in modeling the amplitude of the scalar waveform, but find that, at least for the last few orbits before merger, the currently available post-Newtonian theory is not sufficient to model the dephasing of the gravitational wave signal in this theory. We further find that there is non-negligible nonlinear enhancement in the scalar field at merger, but that the effect on the peak gravitational wave emission is small.

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Maxence Corman, Justin L. Ripley, William E. East. 2022-10-17. Nonlinear studies of binary black hole mergers in Einstein-scalar-Gauss-Bonnet gravity. https://doi.org/10.1103/physrevd.107.024014

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