Extreme gravity tests with gravitational waves from compact binary coalescences: (II) ringdown

Berti, Emanuele; Yagi, Kent; Yang, Huan; Yunes, Nicolás

doi:10.1007/s10714-018-2372-6

Cited by 315 publications

(247 citation statements)

References 285 publications

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“…Theoretically the ringdown phase can be studied in terms of quasi-normal modes (QNMs) [11][12][13][14]. Observationally, however, the precision of the detected signals is not yet sufficient to extract the QNMs, although the next generation of instruments is expected to achieve the necessary sensitivity [15,16].…”

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confidence: 99%

Axial quasinormal modes of neutron stars in R2 gravity

et al. 2018

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The spectrum of frequencies and characteristic times that compose the ringdown phase of gravitational waves emitted by neutron stars carry information about the matter content (the equation of state) and the underlying theory of gravity. Typically, modified theories of gravity introduce additional degrees of freedom/fields, such as scalars, which result in new families of modes composing the ringdown spectrum. One simple but physically promising candidate is R 2 gravity, which effectively introduces an additional massive scalar field that couples non-minimally to gravity, resulting in scalarized neutron stars. Here we show that the ringdown spectrum of R 2 neutron stars is much richer and fundamentally different from the spectrum in GR, possessing for instance ultra long lived modes that can propagate away from the star in the form of scalar gravitational radiation.

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confidence: 99%

Axial quasinormal modes of neutron stars in R2 gravity

et al. 2018

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“…where we have redefined the coalescence time viat c ≡ t c + R. Note that the above expressions are different from the ones given in Eqs. (66) - (74) in [44] because here we 8 For detectors, such as LIGO, Virgo and KAGRA, one can treat q N (l) as time-independent, since their observation windows are very short [68]. However, for detectors like LISA, this approximation needs to be relaxed, as we will discuss in the next subsection.…”

Section: A Ground-based L-shape Detectorsmentioning

confidence: 99%

Gravitational waves from the quasicircular inspiral of compact binaries in Einstein-aether theory

et al. 2020

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We study gravitational waves emitted by a binary system of non-spinning bodies in a quasi-circular inspiral within the framework of Einstein-aether theory. In particular, we compute explicitly and analytically the expressions for the time-domain and frequency-domain waveforms, gravitational wave polarizations, and response functions for both ground-and space-based detectors in the post-Newtonian approximation. We find that, when going beyond leading-order in the post-Newtonian approximation, the non-Einsteinian polarization modes contain terms that depend on both the first and the second harmonics of the orbital phase. We also calculate analytically the corresponding parameterized post-Einsteinian parameters, generalizing the existing framework to allow for different propagation speeds among scalar, vector and tensor modes, without assumptions about the magnitude of its coupling parameters, and meanwhile allowing the binary system to have relative motions with respect to the aether field. Such results allow for the easy construction of Einstein-aether templates that could be used in Bayesian tests of General Relativity in the future. * Anzhong Wang@baylor.edu; Corresponding Author 1 Recently, various GWs have been detected after LIGO/Virgo resumed operations on April 1, 2019, possibly including the coalescence of a neutron-star (NS)/BH binary. The details of these detections have not yet been released [3].

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“…where R 2 GB is the Gauss-Bonnet invariant 5 For a review about tests of black hole dynamics in modified theories of gravity see e.g. [38].…”

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

confidence: 99%

“…A robust signal of the presence of an additional degree of freedom can be imprinted on the waves emitted during the ringdown phase, when the newly formed and highly perturbed merger remnant relaxes to its equilibrium configuration. A potential deviation from the predictions of GR can have two origins: the scalar field may have a non trivial background that deforms the geometry of the final black hole, or there can be a mixing between gravitational and scalar perturbations around the background solution [38]. Both will ultimately affect the spectrum of the quasinormal modes.…”

Section: Observable Effects In the Ringdownmentioning

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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Extreme gravity tests with gravitational waves from compact binary coalescences: (II) ringdown

Cited by 315 publications

References 285 publications

Axial quasinormal modes of neutron stars in R2 gravity

Axial quasinormal modes of neutron stars in R2 gravity

Gravitational waves from the quasicircular inspiral of compact binaries in Einstein-aether theory

Black hole ringdown as a probe for dark energy

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