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  Hairy binary black holes in Einstein-Maxwell-dilaton theory and their effective-one-body description

Khalil, M., Sennett, N., Steinhoff, J., Vines, J., & Buonanno, A. (2018). Hairy binary black holes in Einstein-Maxwell-dilaton theory and their effective-one-body description. Physical Review D, 98(10): 104010. doi:10.1103/PhysRevD.98.104010.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-4AF1-B Version Permalink: http://hdl.handle.net/21.11116/0000-0002-EDCC-E
Genre: Journal Article

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 Creators:
Khalil, Mohammed, Author
Sennett, Noah1, Author              
Steinhoff, Jan1, Author              
Vines, Justin1, Author              
Buonanno, Alessandra1, Author              
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1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1933290              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc, Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE,High Energy Physics - Theory, hep-th
 Abstract: In General Relativity and many modified theories of gravity, isolated black holes (BHs) cannot source massless scalar fields. Einstein-Maxwell-dilaton (EMd) theory is an exception: through couplings both to electromagnetism and (non-minimally) to gravity, a massless scalar field can be generated by an electrically charged BH. In this work, we analytically model the dynamics of binaries comprised of such scalar-charged ("hairy") BHs. While BHs are not expected to have substantial electric charge within the Standard Model of particle physics, nearly-extremally charged BHs could occur in models of minicharged dark matter and dark photons. We begin by studying the test-body limit for a binary BH in EMd theory, and we argue that only very compact binaries of nearly-extremally charged BHs can manifest non-perturbative phenomena similar to those found in certain scalar-tensor theories. Then, we use the post-Newtonian approximation to study the dynamics of binary BHs with arbitrary mass ratios. We derive the equations governing the conservative and dissipative sectors of the dynamics at next-to-leading order, use our results to compute the Fourier-domain gravitational waveform in the stationary-phase approximation, and compute the number of useful cycles measurable by the Advanced LIGO detector. Finally, we construct two effective-one-body (EOB) Hamiltonians for binary BHs in EMd theory: one that reproduces the exact test-body limit and another whose construction more closely resembles similar models in General Relativity, and thus could be more easily integrated into existing EOB waveform models used in the data analysis of gravitational-wave events by the LIGO and Virgo collaborations.

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 Dates: 2018-09-032018
 Publication Status: Published in print
 Pages: 36 pages, 12 figures
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 Identifiers: arXiv: 1809.03109
URI: http://arxiv.org/abs/1809.03109
DOI: 10.1103/PhysRevD.98.104010
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Title: Physical Review D
Source Genre: Journal
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Pages: - Volume / Issue: 98 (10) Sequence Number: 104010 Start / End Page: - Identifier: -