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  Extreme mass-ratio inspirals around a spinning horizonless compact object

Maggio, E., van de Meent, M., & Pani, P. (2021). Extreme mass-ratio inspirals around a spinning horizonless compact object. Physical Review D, 104(9): 104026. doi:10.1103/PhysRevD.104.104026.

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Maggio, Elisa, Author
van de Meent, Maarten1, Author              
Pani, Paolo, 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 - Phenomenology, hep-ph,High Energy Physics - Theory, hep-th
 Abstract: Extreme mass-ratio inspirals (EMRIs) detectable by the Laser Interferometer Space Antenna (LISA) are unique probes of the nature of supermassive compact objects. We compute the gravitational-wave signal emitted by a stellar-mass compact object in a circular equatorial orbit around a Kerr-like horizonless supermassive object defined by an effective radius and a reflectivity coefficient. The Teukolsky equations are solved consistently with suitable (frequency-dependent) boundary conditions, and the modified energy and angular-momentum fluxes are used to evolve the orbital parameters adiabatically. The gravitational fluxes have resonances corresponding to the low-frequency quasinormal modes of the central object, which can contribute significantly to the gravitational-wave phase. Overall, the absence of a classical event horizon in the central object can affect the gravitational-wave signal dramatically, with deviations even larger than those previously estimated by a model-independent analysis of the tidal heating. We estimate that EMRIs could potentially place the most stringent constraint on the reflectivity of supermassive compact objects at the remarkable level of ${\cal O}(10^{-6})\%$ and would allow to constrain various models which are not ruled out by the ergoregion instability. In particular, an EMRI detection could allow to rule out (or provide evidence for) signatures of quantum black-hole horizons with Boltzmann reflectivity. Our results motivate performing rigorous parameter estimations to assess the detectability of these effects.

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 Dates: 2021-06-142021
 Publication Status: Published in print
 Pages: 10+3 pages, 9 figures
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 Identifiers: arXiv: 2106.07195
DOI: 10.1103/PhysRevD.104.104026
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Title: Physical Review D
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Pages: - Volume / Issue: 104 (9) Sequence Number: 104026 Start / End Page: - Identifier: -