Equatorial extreme-mass-ratio inspirals in Kerr black holes with scalar hair spacetimes

Abstract

In this work we analyze some judiciously chosen solutions of Kerr Black Holes with Scalar Hair (KBHsSH) of special interest for Gravitational Wave (GW) events originated from Extreme Mass Ratio Inspirals (EMRIs). Because of the off-center distribution of energy density, these spacetimes are warped in such a way that not all metric functions behave monotonically on the equatorial plane as in the exterior region of Kerr black holes (KBHs). This has great impact on the orbital parameters, which in turn affects the imprints on signals descendant from EMRIs in a adiabatic evolution. By investigating circular obit parameters, we unveil what qualitative features could be present in the signals that are new and distinct compared to KBHs, and we evolve some inspirals by employing the usual quadrupole formula approximation. We show that the frequencies of the emitted signals behave nonmonotonically, i.e. they can backward chirp, and for some particular cases they can become arbitrarily small, falling below LISA's sensibility range. Finally, we present two sets of waveforms produced by a noncircular EMRI in which the compact object (CO) follows a type of geodesic motion typically present in spacetimes with a static ring (SR), in which the compact object is periodically momentarily at rest.

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Cited by in corpus (13)

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• Detecting massive scalar fields with Extreme Mass-Ratio Inspirals
• Equatorial timelike circular orbits around generic ultracompact objects
• Extreme-mass-ratio inspirals into rotating boson stars: nonintegrability, chaos, and transient resonances
• Probing fundamental physics with Extreme Mass Ratio Inspirals: a full Bayesian inference for scalar charge
• Testing gravity with Extreme-Mass-Ratio Inspirals
• The fate of observers in circular motion
• Resonant excitation of eccentricity in spherical extreme-mass-ratio inspirals
• Gravitational odd-parity perturbation of a Horndeski hairy black hole: quasinormal mode and parameter constraint
• Imprints of extra dimensions in eccentric extreme-mass-ratio inspirals gravitational waveforms
• Splitting the Gravitational Atom: Instabilities of Black Holes with Synchronized or Resonant Hair
• There and back again: Outspiraling motion in non-Kerr compact objects
• Extreme mass-ratio inspirals as probes of scalar fields: eccentric equatorial orbits around Kerr black holes