@article{26b01b0e62884f26aef3d71c37b5bfc7,
title = "Black holes in massive dynamical Chern-Simons gravity: Scalar hair and quasibound states at decoupling",
abstract = "Black holes have a unique sensitivity to the presence of ultralight matter fields or modifications of the underlying theory of gravity. In the present paper we combine both features by studying an ultralight, dynamical scalar field that is nonminimally coupled to the gravitational Chern-Simons term. In particular, we numerically simulate the evolution of such a scalar field around a rotating black hole in the decoupling approximation and find a new kind of massive scalar hair anchored around the black hole. In the proximity of the black hole, the scalar exhibits the typical dipolar structure of hairy solutions in (massless) dynamical Chern-Simons gravity. At larger distances, the field transitions to an oscillating scalar cloud that is induced by the mass term. Finally, we complement the time-domain results with a spectral analysis of the scalar field characteristic frequencies.",
author = "Chloe Richards and Alexandru Dima and Helvi Witek",
note = "We thank Stephon Alexander, Noora Ghadiri, Leah Jenks, Hector O. Silva, Leo Stein and Nicolas Yunes for insightful discussions and comments. We are indebted to Cheng-Hsin Cheng for providing useful technical insights for the visualization of our data. The authors acknowledge support provided by the National Science Foundation under NSF Awards No. OAC-2004879 and No. PHY-2110416. We acknowledge the Texas Advanced Computing Center (TACC) at the University of Texas at Austin for providing HPC resources on Frontera via allocations PHY22018 and PHY22041. This work used the Extreme Science and Engineering Discovery Environment (XSEDE) system Expanse through the allocation TG-PHY210114, which was supported by NSF Grants No. ACI-1548562 and No. PHY-210074. This research used resources provided by the Delta research computing project, which is supported by the NSF Award No. OCI-2005572 and the State of Illinois. We thank KITP for its hospitality during the workshop \textbackslash{}u201CHigh-Precision Gravitational Waves\textbackslash{}u201D which was supported in part by NSF Award No. PHY-1748958. We acknowledge support by NSF Award No. NSF-1759835 for the \textbackslash{}u201CNew frontiers in Strong Gravity\textbackslash{}u201D workshop where part of this work has been completed. We thank Steven Brandt for supporting travel to the North American Einstein Toolkit workshop via the NSF Award No. OAC-1550551 where part of this work was presented. This work used the open-source softwares xtensor , the einstein toolkit , canuda , postcactus . The canuda -d cs code developed to conduct the simulations in this work is open source and available in a git repository . A YouTube playlist with 2D animations rendered from data produced with our simulations is available at .",
year = "2023",
month = aug,
day = "15",
doi = "10.1103/PhysRevD.108.044078",
language = "English (US)",
volume = "108",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "4",
}