@article{362ebf8368d144198f03bc703aceac80,
title = "Black holes and binary mergers in scalar Gauss-Bonnet gravity: Scalar field dynamics",
abstract = "We study the nonlinear dynamics of black holes that carry scalar hair and binaries composed of such black holes. The scalar hair is due to a linear or exponential coupling between the scalar and the Gauss-Bonnet invariant. We work perturbatively in the coupling constant of that interaction but nonperturbatively in the fields. We first consider the dynamical formation of hair for isolated black holes of arbitrary spin and determine the final state. This also allows us to compute for the first time the scalar quasinormal modes of rotating black holes in the presence of this coupling. We then study the evolution of nonspinning black hole binaries with various mass ratios and produce the first scalar waveform for a coalescence. An estimate of the energy loss in scalar radiation and the effect this has on orbital dynamics and the phase of gravitational waves (GWs) (entering at quadratic order in the coupling) shows that GW detections can set the most stringent constraint to date on theories that exhibit a coupling between a scalar field and the Gauss-Bonnet invariant.",
author = "Helvi Witek and Leonardo Gualtieri and Paolo Pani and Sotiriou, {Thomas P.}",
note = "Funding Information: We thank K. Yagi for sharing his notes used in Sec. and for useful discussions. We also thank M. Okounkova and L. Stein for useful discussions and comments. H. W. acknowledges financial support provided by the European Union{\textquoteright}s H2020 research and innovation program under Marie Sklodowska-Curie Grant Agreement No. BHstabNL-655360, by the Royal Society University Research Fellowship UF160547 and the Royal Society Research Grant No. RGF\R1\180073. She also acknowledges partial support by Spanish ministery of science and innovation (MICINN) Grant No. FPA-2016-76005-C2-2-P and Generalitat de Catalunya Grant No. AGAUR SGR-2017-754. P. P. acknowledges financial support provided under the European Union{\textquoteright}s H2020 ERC, Starting Grant Agreement No. DarkGRA–757480. T. P. S. acknowledges partial support from the STFC Consolidated Grant No. ST/P000703/1. This project has received funding from the European Union{\textquoteright}s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant Agreement No. 690904. The authors would like to acknowledge networking support by the COST Action CA16104. We thankfully acknowledge the computer resources at Marenostrum IV, Finis Terrae II and LaPalma and the technical support provided by the Barcelona Supercomputing Center via the PRACE Grant Tier-0 PPFPWG, and via the Barcelona Supercomputing Center/Spanish Supercomputing Network (BSC)/RES Grants No. AECT-2017-2-0011, No. AECT-2017-3-0009, and No. AECT-2018-1-0014. The code developed for this paper is based on the Einstein Toolkit and public at Ref. . The xTensor package for mathematica has been used. Publisher Copyright: {\textcopyright} 2019 American Physical Society.",
year = "2019",
month = mar,
day = "15",
doi = "10.1103/PhysRevD.99.064035",
language = "English (US)",
volume = "99",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "6",
}