Absorption by black hole remnants in metric-affine gravity

Delhom, Adrià; Macedo, Caio F. B.; Olmo, Gonzalo J.; Crispino, Luís C. B.

doi:10.1103/physrevd.100.024016

Cited by 28 publications

(28 citation statements)

References 90 publications

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“…Gravitational-wave (GW) echoes in the post-merger signal of a compact binary coalescence might be a smoking gun of near-horizon quantum structures [1][2][3][4], exotic compact objects (ECOs), exotic states of matter in ultracompact stars [5][6][7], and of modified theories of gravity [8,9] (see [10][11][12] for some recent reviews). Detecting echoes in the GW data of LIGO/Virgo and of future GW observatories would allow us to probe the near-horizon structure of compact objects.…”

Section: Introductionmentioning

confidence: 99%

Analytical model for gravitational-wave echoes from spinning remnants

et al. 2019

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Gravitational-wave echoes in the post-merger signal of a binary coalescence are predicted in various scenarios, including near-horizon quantum structures, exotic states of matter in ultracompact stars, and certain deviations from general relativity. The amplitude and frequency of each echo is modulated by the photon-sphere barrier of the remnant, which acts as a spin-and frequencydependent high-pass filter, decreasing the frequency content of each subsequent echo. Furthermore, a major fraction of the energy of the echo signal is contained in low-frequency resonances corresponding to the quasi-normal modes of the remnant. Motivated by these features, in this work we provide an analytical gravitational-wave template in the low-frequency approximation describing the postmerger ringdown and the echo signal of a spinning ultracompact object. Besides the standard ringdown parameters, the template is parametrized in terms of only two physical quantities: the reflectivity coefficient and the compactness of the remnant. We discuss novel effects related to the spin and to the complex reflectivity, such as a more involved modulation of subsequent echoes, the mixing of two polarizations, and the ergoregion instability in case of perfectly-reflecting spinning remnants. Finally, we compute the errors in the estimation of the template parameters with current and future gravitational-wave detectors using a Fisher matrix framework. Our analysis suggests that models with almost perfect reflectivity can be excluded/detected with current instruments, whereas probing values of the reflectivity smaller than 80% at 3σ confidence level requires future detectors (Einstein Telescope, Cosmic Explorer, LISA). The template developed in this work can be easily implemented to perform a matched-filter based search for echoes and to constrain models of exotic compact objects.

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Section: Introductionmentioning

confidence: 99%

Analytical model for gravitational-wave echoes from spinning remnants

et al. 2019

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“…The interaction of BHs with fields may lead to interesting phenomena, for instance, absorption [25][26][27][28][29][30][31][32][33][34][35], scattering [36][37][38][39], and radiation emission [40][41][42][43]. In particular, the absorption and scattering of fields are of major interest in the description of fields around BHs, since they are related to processes occurring in active galactic nuclei (AGN) [44,45].…”

Section: Introductionmentioning

confidence: 99%

4D Einstein-Gauss-Bonnet gravity: Massless particles and absorption of planar spin-0 waves

2020

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We investigate the absorption cross section of planar scalar massless waves impinging on spherically symmetric black holes which are solutions of the novel 4D Einstein-Gauss-Bonnet theory of gravity. Besides the mass of the black hole, the solution depends also on the Gauss-Bonnet constant coupling. Using the partial waves approach, we show that the absorption cross section depends on the Gauss-Bonnet coupling constant. Our numerical results present excellent agreement with the low-and high-frequency approximations, including the so-called sinc approximation.

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“…The remnant’s quasinormal mode spectrum differs from that of a BH, providing a further method for testing BH physics [ 52 ]. The boundary conditions of ECOs are dramatically different from those of a BH, which can lead to “echoes” of the prompt ringdown [ 71 , 80 , 81 , 101 , 112 , 161 , 189 , 196 , 244 ]; see [ 84 , 85 ] for recent reviews. Echoes in the GW data would allow us to probe the near-horizon structure of compact objects.…”

Section: New Theories Old Problemsmentioning

confidence: 99%

Probing the nature of black holes: Deep in the mHz gravitational-wave sky

et al. 2021

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Black holes are unique among astrophysical sources: they are the simplest macroscopic objects in the Universe, and they are extraordinary in terms of their ability to convert energy into electromagnetic and gravitational radiation. Our capacity to probe their nature is limited by the sensitivity of our detectors. The LIGO/Virgo interferometers are the gravitational-wave equivalent of Galileo’s telescope. The first few detections represent the beginning of a long journey of exploration. At the current pace of technological progress, it is reasonable to expect that the gravitational-wave detectors available in the 2035-2050s will be formidable tools to explore these fascinating objects in the cosmos, and space-based detectors with peak sensitivities in the mHz band represent one class of such tools. These detectors have a staggering discovery potential, and they will address fundamental open questions in physics and astronomy. Are astrophysical black holes adequately described by general relativity? Do we have empirical evidence for event horizons? Can black holes provide a glimpse into quantum gravity, or reveal a classical breakdown of Einstein’s gravity? How and when did black holes form, and how do they grow? Are there new long-range interactions or fields in our Universe, potentially related to dark matter and dark energy or a more fundamental description of gravitation? Precision tests of black hole spacetimes with mHz-band gravitational-wave detectors will probe general relativity and fundamental physics in previously inaccessible regimes, and allow us to address some of these fundamental issues in our current understanding of nature.

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Absorption by black hole remnants in metric-affine gravity

Cited by 28 publications

References 90 publications

Analytical model for gravitational-wave echoes from spinning remnants

Analytical model for gravitational-wave echoes from spinning remnants

4D Einstein-Gauss-Bonnet gravity: Massless particles and absorption of planar spin-0 waves

Probing the nature of black holes: Deep in the mHz gravitational-wave sky

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