Slowly rotating supercompact Schwarzschild stars

Posada, Camilo

doi:10.1093/mnras/stx523

Cited by 31 publications

(47 citation statements)

References 79 publications

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“…Explicit examples are given in Refs. [106,119,141,142,222,348]. Therefore, if one is interested in the very small limit, one can study a Kerr-like ECO [163,303,315,322], i.e.…”

Section: The Role Of the Spinmentioning

confidence: 99%

Testing the nature of dark compact objects: a status report

2019

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Very compact objects probe extreme gravitational fields and may be the key to understand outstanding puzzles in fundamental physics. These include the nature of dark matter, the fate of spacetime singularities, or the loss of unitarity in Hawking evaporation. The standard astrophysical description of collapsing objects tells us that massive, dark and compact objects are black holes. Any observation suggesting otherwise would be an indication of beyond-the-standard-model physics. Null results strengthen and quantify the Kerr black hole paradigm. The advent of gravitationalwave astronomy and precise measurements with very long baseline interferometry allow one to finally probe into such foundational issues. We overview the physics of exotic dark compact objects and their observational status, including the observational evidence for black holes with current and future experiments.

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“…Explicit examples are given in Refs. [106,119,141,142,222,348]. Therefore, if one is interested in the very small limit, one can study a Kerr-like ECO [163,303,315,322], i.e.…”

Section: The Role Of the Spinmentioning

confidence: 99%

Testing the nature of dark compact objects: a status report

2019

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“…Nevertheless, for perturbative solutions to the vacuum Einstein's equation that admit a smooth BH limit, all multipole moments of the external spacetime approach those of a Kerr BH in the high-compactness regime [21] (for specific examples, see Refs. [32][33][34][35][36][37]). Therefore, we conservatively assume that the small object follows the geodesics of a Kerr metric, with orbital parameters that evolve secularly due to energy and angular momentum fluxes.…”

Section: A Backgroundmentioning

confidence: 99%

Tidal heating as a discriminator for horizons in extreme mass ratio inspirals

et al. 2020

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The defining feature of a classical black hole is being a perfect absorber. Any evidence showing otherwise would indicate a departure from the standard black-hole picture. Energy and angular momentum absorption by the horizon of a black hole is responsible for tidal heating in a binary. This effect is particularly important in the latest stages of an extreme mass ratio inspiral around a spinning supermassive object, one of the main targets of the future LISA mission. We study how this effect can be used to probe the nature of supermassive objects in a model independent way. We compute the orbital dephasing and the gravitational-wave signal emitted by a point particle in circular, equatorial motion around a spinning supermassive object to the leading order in the mass ratio. Absence of absorption by the central object can affect the gravitational-wave signal dramatically, especially at high spin. This effect will make it possible to put an unparalleled upper bound on the reflectivity of exotic compact objects, at the level of O(0.01)%. This stringent bound would exclude the possibility of observing echoes in the ringdown of a supermassive binary merger.

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“…This implies that the multipolar structure of a spinning ECO might be different from that of a Kerr BH [47,48]. Nevertheless, for perturbative solutions to the vacuum Einstein's equation that admit a smooth BH limit, all multipole moments of the external spacetime approach those of a Kerr BH in the high-compactness regime [47] (for specific examples, see [49][50][51][52][53][54]).…”

Section: A Backgroundmentioning

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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Slowly rotating supercompact Schwarzschild stars

Cited by 31 publications

References 79 publications

Testing the nature of dark compact objects: a status report

Testing the nature of dark compact objects: a status report

Tidal heating as a discriminator for horizons in extreme mass ratio inspirals

Analytical model for gravitational-wave echoes from spinning remnants

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