Slowly rotating black holes in Einstein-Dilaton-Gauss-Bonnet gravity: Quadratic order in spin solutions

Ayzenberg, Dimitry; Yunes, Nicolás

doi:10.1103/physrevd.90.044066

Cited by 185 publications

(120 citation statements)

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“…Including spin in current approaches is challenging, especially because the geometry of spinning BHs beyond GR is known only perturbatively or numerically (see e.g. [49][50][51][52][53][54][55] for specific examples and [11,56,57] for reviews), which makes it very hard to compute the QNMs. In addition, there is in general no analog of the Teukolsky equation [6,58,59] beyond GR.…”

Section: Introductionmentioning

confidence: 99%

“…These departures can be due to extra charges, a modified theory of gravity, environmental effects, etcetera, and we wish to develop a generic framework that can accommodate various special cases. GR corrections might affect the ringdown in two ways: by predicting a spinning BH other than Kerr [11,12,15,50,51,53,57,66], or (even if GR BHs are still solutions of the theory) by affecting the dynamics of the perturbations [40,[67][68][69][70][71]. In both cases, the ringdown modes will acquire corrections proportional to the fundamental coupling constant(s) of the theory.…”

Section: Introductionmentioning

confidence: 99%

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Parametrized ringdown spin expansion coefficients: A data-analysis framework for black-hole spectroscopy with multiple events

et al. 2020

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Black-hole spectroscopy is arguably the most promising tool to test gravity in extreme regimes and to probe the ultimate nature of black holes with unparalleled precision. These tests are currently limited by the lack of a ringdown parametrization that is both robust and accurate. We develop an observable-based parametrization of the ringdown of spinning black holes beyond general relativity, which we dub ParSpec (Parametrized Ringdown Spin Expansion Coefficients). This approach is perturbative in the spin, but it can be made arbitrarily precise (at least in principle) through a high-order expansion. It requires O(10) ringdown detections, which should be routinely available with the planned space mission LISA and with third-generation ground-based detectors. We provide a preliminary analysis of the projected bounds on parametrized ringdown parameters with LISA and with the Einstein Telescope, and discuss extensions of our model that can be straightforwardly included in the future. arXiv:1910.12893v1 [gr-qc] 28 Oct 2019where J = 1, 2, ..., q labels the mode; M i and χ i 1 are the detector-frame mass and spin of the i-th source, both measured assuming GR (see below); D is the order of the spin expansion; w (n) J and t (n) J are the dimensionless coefficients of the spin expansion for a Kerr BH in GR (provided in Table I for a few representative modes); γ i are dimensionless coupling constants, which can depend on the source i -see Eq. (6) below -but do not depend 1 The QNMs are identified by three integer numbers: the angular momentum number l, the azimuthal number m ∈ [−l, l], and the overtone number, which we set to zero in this paper, i.e. we only consider fundamental modes. For ease of notation we leave these indices implicit, i.e. ω (J) ≡ ω (0lm) , where J is an index that labels the mode. (n) J and δt (n) J (n) J and δt (n) J (or, equivalently, δW (n) J and δT (n) J ), these corrections depend only on the theory and not on the source.It is easy to check that, to leading order in α, the redefinitionsbring Eqs. (A1) and (A2) to the form in Eqs.(3) and (4) used in the main text. The above redefinitions also show that there is some degeneracy among the beyond-GR parameters, and that one can only constrain the combinations δw (n) J and δt (n) J , which contains the intrinsic mode corrections (δW (n) J and δT (n) J ) and the mass and spin corrections (δm and δχ).(n) J and δt (n) J are unconstrained by the data.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Parametrized ringdown spin expansion coefficients: A data-analysis framework for black-hole spectroscopy with multiple events

et al. 2020

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“…Hairy solutions in sGB theories have been studied mainly in the case when the only other operators present are the Einstein-Hilbert and the standard kinetic term for the scalar, X [7][8][9][10][11][12][13]. In the language of the above Lagrangian, this case amounts to the choices G 2 = X, G 4 = Λ 6 /Λ 6 3 and G 5 = −4 Λ 9 Λ 8 2 M P α log(X), with the remaining functions set to zero.…”

Section: Shift-symmetric Scalar-tensor Theories and Hairy Black Hmentioning

confidence: 99%

“…1 As a prototypical example, we will consider below the case of a linear coupling between the scalar and the Gauss-Bonnet operator, whose presence is known to be sufficient to evade the no-hair restrictions [6]. In the literature, such shift-symmetric operator has been widely studied, both analytically and numerically, in the simplest setting in which the only other operator in the Lagrangian for the scalar is the canonical kinetic term [7][8][9][10][11][12][13].…”

Section: Introduction and Setupmentioning

confidence: 99%

Black hole ringdown as a probe for dark energy

2020

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Under the assumption that a dynamical scalar field is responsible for the current acceleration of the Universe, we explore the possibility of probing its physics in black hole merger processes with gravitational wave interferometers. Remaining agnostic about the microscopic physics, we use an effective field theory approach to describe the scalar dynamics. We investigate the case in which some of the higher derivative operators, that are highly suppressed on cosmological scales, instead become important on typical distances for black holes. If a coupling to the Gauss-Bonnet operator is one of them, a non-trivial background profile for the scalar field can be sourced in the surrounding of the black hole, resulting in a potentially large amount of 'hair'. In turn, this can induce sizeable modifications to the spacetime geometry or a mixing between the scalar and the gravitational perturbations. Both effects will ultimately translate into a modification of the quasi-normal mode spectrum in a way that is also sensitive to other operators besides the one sourcing the scalar background. The presence of deviations from the predictions of general relativity in the observed spectrum can therefore serve as a window onto dark energy physics.

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“…All these studies are based on the assumption that the underlying gravity theory is general relativity. Nevertheless, there are also black holes in alternative gravity theories [21][22][23][24][25][26] based on different motivations. It is interesting to study the observational signature of a black hole (and hot spot) in these theories.…”

Section: Introductionmentioning

confidence: 99%

Observational signature of a near-extremal Kerr-Sen black hole in the heterotic string theory

2020

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We analytically study the optical appearance of an isotropically emitter orbiting near the horizon of a near-extremely rotating Kerr-Sen (KS) black hole which is an electrically charged black hole arising in heterotic string theory. We study the influence of the Sen charge on the observational quantities, including the image position, flux and redshift factor. Moreover, we compare the results with those for a near-extremal Kerr-Newman (KN) black hole, which is the charged rotating black hole in general relativity. We find quantitative corrections of the signatures of these charged black holes (both KS and KN) compare to that of a neutral Kerr black hole. This may serve as distinctive features of different black holes for future tests by the Event Horizon Telescope.

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Slowly rotating black holes in Einstein-Dilaton-Gauss-Bonnet gravity: Quadratic order in spin solutions

Cited by 185 publications

References 57 publications

Parametrized ringdown spin expansion coefficients: A data-analysis framework for black-hole spectroscopy with multiple events

Parametrized ringdown spin expansion coefficients: A data-analysis framework for black-hole spectroscopy with multiple events

Black hole ringdown as a probe for dark energy

Observational signature of a near-extremal Kerr-Sen black hole in the heterotic string theory

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