Extreme mass-ratio inspirals as probes of scalar fields: Eccentric equatorial orbits around Kerr black holes

Barsanti, Susanna; Franchini, Nicola; Gualtieri, Leonardo; Maselli, Andrea; Sotiriou, Thomas P.

doi:10.1103/physrevd.106.044029

Cited by 31 publications

(15 citation statements)

References 123 publications

(153 reference statements)

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“…4, we see that at these "astronomically close" extraction radii, the scalar gravitational waves are already 40 times fainter, and they will become more subdominant as they propagate. However, the bottom panel shows that the energy contained in the scalar waves-which stays constant-is only 6 times smaller, which could still indirectly impact the tensor waveforms, e.g., by changing their phase evolution relative to the GR case [105][106][107][108][109].…”

Section: B Scalar Gravitational Wavesmentioning

confidence: 99%

Where is the ringdown: Reconstructing quasinormal modes from dispersive waves

et al. 2022

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We study the generation and propagation of gravitational waves in scalar-tensor gravity using numerical relativity simulations of scalar field collapses beyond spherical symmetry. This allows us to compare the tensor and additional massive scalar waves that are excited. As shown in previous work in spherical symmetry, massive propagating scalar waves decay faster than 1=r and disperse, resulting in an inverse chirp. These effects obscure the ringdown in any extracted signal by mixing it with the transient responses of the collapse during propagation. In this paper we present a simple method to rewind the extracted signals to horizon formation, which allows us to clearly identify the ringdown phase and extract the amplitudes of the scalar quasinormal modes, quantifying their excitation in strong gravity events and verifying the frequencies to perturbative calculations. The effects studied are relevant to any theories in which the propagating waves have a dispersion relation, including the tensor case.

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Section: B Scalar Gravitational Wavesmentioning

confidence: 99%

Where is the ringdown: Reconstructing quasinormal modes from dispersive waves

et al. 2022

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“…Another advantage of EM-RIs is that there is a higher relative impact on the curvature for a given DM density for larger black hole masses, and the dephasing in the frequency of the signal during the inspiral accumulates over many orbits that can be potentially be observed in band or across ground based and space based detectors [88][89][90][91][92][93][94][95]. Studies of the impact of dark matter spikes [25,[27][28][29][96][97][98] and superradiant clouds [30,94,[99][100][101][102][103][104] on EMRIs show that they are potentially detectable with LISA observations.…”

Section: Introductionmentioning

confidence: 99%

Black hole merger simulations in wave dark matter environments

et al. 2023

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The interaction of binary black hole mergers with their environments can be studied using numerical relativity simulations. These start only a short finite time before merger, at which point appropriate initial conditions must be imposed. A key task is therefore to identify the configuration that is appropriate for the binary and its environment at this stage of the evolution. In this work we study the behaviour of wave dark matter around equal mass black hole binaries, finding that there is a preferred, quasi-stationary profile that persists and grows over multiple orbits, in contrast to heavier mass dark matter where any overdensity tends to be dispersed by the binary motion. Whilst different initial configurations converge to the preferred quasi-stationary one after several orbits, unwanted transient oscillations are generated in the process, which may impact on the signal in short simulation runs. We also point out that naively superimposing the matter onto a circular binary results in artificially eccentric orbits due to the matter backreaction, which is an effect of the initial conditions and not a signature of dark matter. We discuss the further work required so that comparison of waveforms obtained with environments to vacuum cases can be done in a meaningful way.

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“…The coupling between scalar fields and higher-order curvature invariants can invalidate the no-hair theorem so that BHs can carry scalar charge which depends on the mass of BH [59][60][61][62]. The possible detection of scalar fields with EMRIs was discussed in [41][42][43][44][45]53]. SMBHs are usually neutral because of long-time charge dissipation through the presence of the plasma around them or the spontaneous production of electron-positron pairs [63][64][65][66][67].…”

Section: Introductionmentioning

confidence: 99%

Detecting vector charge with extreme mass ratio inspirals onto Kerr black holes

Zhang¹,

Guo²,

Gong³

et al. 2023

Preprint

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Extreme mass ratio inspirals (EMRIs) are excellent sources for space-based observatories to explore the properties of black holes and test no-hair theorems. We consider EMRIs with a charged compact object inspiralling onto a Kerr black hole in quasi-circular orbits. Using the Teukolsky and generalized Sasaki-Nakamura formalisms for the gravitational and vector perturbations about a Kerr black hole, we numerically calculate the energy fluxes for both gravitational and vector perturbations induced by a charged particle moving in equatorial circular orbits. With one-year observations of EMRIs, we apply the Fisher information matrix method to estimate the charge uncertainty detected by space-based gravitational wave detectors such as the Laser Interferometer Space Antenna, TianQin, and Taiji, and we find that it is possible to detect vector charge as small as q ∼ 0.0049. The results show that EMRIs composed of a Kerr black hole with a higher spin a and lighter mass M , and a secondary charged object with more vector charge give smaller relative error on the charge, thus constrain the charge better. The positive spin of the Kerr black hole can decrease the charge uncertainty by about one or two orders of magnitude.

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Extreme mass-ratio inspirals as probes of scalar fields: Eccentric equatorial orbits around Kerr black holes

Cited by 31 publications

References 123 publications

Where is the ringdown: Reconstructing quasinormal modes from dispersive waves

Where is the ringdown: Reconstructing quasinormal modes from dispersive waves

Black hole merger simulations in wave dark matter environments

Detecting vector charge with extreme mass ratio inspirals onto Kerr black holes

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