Quantum gravity and gravitational-wave astronomy

Calcagni, Gianluca; Kuroyanagi, Sachiko; Marsat, Sylvain; Sakellariadou, Mairi; Tamanini, Nicola; Tasinato, Gianmassimo

doi:10.1088/1475-7516/2019/10/012

Cited by 70 publications

(85 citation statements)

References 253 publications

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“…This result, different from but complementary [48] to what found in the effective field theory approach to QG, applies to the nonperturbative GFT/SF/LQG theories with γ > 1 at mesoscopic scales. Assuming that photon geodesics are not modified at those scales, GR tests within the solar system using the Cassini bound impose ∆Φ/Φ < 10 −5 [53,54], implying…”

Section: Complementary Constraintscontrasting

confidence: 59%

“…Therefore, observations can place constraints on the two parameters ℓ * and γ in a model-independent way, by constraining the ratio d gw L (z)/d em L (z) as a function of the redshift of the source. Our analysis is based on two standard sirens (with associated EM counterpart): the binary neutron-star merger GW170817 observed by LIGO-Virgo and the Fermi telescope [8], and a simulated z = 2 supermassive black hole merging event that could be observed by LISA [48][49][50]. There are three cases to consider:…”

Section: Gravitational Wavesmentioning

confidence: 99%

“…(5) is valid in a near-IR regime and γ = Γ meso is very close to 1 from above. Using a Bayesian analysis identical to that of [9] (page 11) where ℓ * is fixed and the constraint on γ is inferred [48], the resulting upper bound on γ is shown in Fig. 1.…”

Section: Gravitational Wavesmentioning

confidence: 99%

“…The only theories in our list that do so are those where Γ UV > Γ meso > 1 (the last three in Tab. 1: κ-Minkowski spacetime with ordinary measure and bicross-product or relative-locality Laplacians and Padmanabhan's model [48]) or Γ meso > 1 > Γ UV (GFT/SF/LQG [27]). However, we exclude observability of the models with Γ UV > Γ meso > 1, since they predict Γ meso − 1 ∼ (ℓ Pl /d em L ) 2 < 10 −116 [48].…”

Section: Gravitational Wavesmentioning

confidence: 99%

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Gravitational-wave luminosity distance in quantum gravity

et al. 2019

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Dimensional flow, the scale dependence of the dimensionality of spacetime, is a feature shared by many theories of quantum gravity (QG). We present the first study of the consequences of QG dimensional flow for the luminosity distance scaling of gravitational waves in the frequency ranges of LIGO and LISA. We find generic modifications with respect to the standard general-relativistic scaling, largely independent of specific QG proposals. We constrain these effects using two examples of multimessenger standard sirens, the binary neutron-star merger GW170817 and a simulated supermassive black-hole merger event detectable with LISA. We apply these constraints to various QG candidates, finding that the quantum geometries of group field theory, spin foams and loop quantum gravity can give rise to observable signals in the gravitational-wave spin-2 sector. Our results complement and improve GW propagation-speed bounds on modified dispersion relations. Under more model-dependent assumptions, we also show that bounds on quantum geometry can be strengthened by solar-system tests.

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Section: Complementary Constraintscontrasting

confidence: 59%

Section: Gravitational Wavesmentioning

confidence: 99%

Section: Gravitational Wavesmentioning

confidence: 99%

Section: Gravitational Wavesmentioning

confidence: 99%

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Gravitational-wave luminosity distance in quantum gravity

et al. 2019

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“…As test-beds for theory of SF-GR itself, due to the possibility of still unexplored and yet to be found experimental predictions and crucial observational implications [11,12].…”

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confidence: 99%

The Wave-Front Equation of Gravitational Signals in Classical General Relativity

Cremaschini

Tessarotto

2020

Symmetry

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In this paper the dynamical equation for propagating wave-fronts of gravitational signals in classical general relativity (GR) is determined. The work relies on the manifestly-covariant Hamilton and Hamilton–Jacobi theories underlying the Einstein field equations recently discovered (Cremaschini and Tessarotto, 2015–2019). The Hamilton–Jacobi equation obtained in this way yields a wave-front description of gravitational field dynamics. It is shown that on a suitable subset of configuration space the latter equation reduces to a Klein–Gordon type equation associated with a 4-scalar field which identifies the wave-front surface of a gravitational signal. Its physical role and mathematical interpretation are discussed. Radiation-field wave-front solutions are pointed out, proving that according to this description, gravitational wave-fronts propagate in a given background space-time as waves characterized by the invariant speed-of-light c. The outcome is independent of the actual shape of the same wave-fronts and includes the case of gravitational waves which are characterized by an eikonal representation and propagate in a generic curved space-time along a null geodetics. The same waves are shown: (a) to correspond to the geometric-optics limit of the same curved space-time solutions; (b) to propagate in a flat space-time as plane waves with constant amplitude; (c) to display also the corresponding form of the wave-front in curved space-time. The result is consistent with the theory of the linearized Einstein field equations and the existence of gravitational waves achieved in such an asymptotic regime. Consistency with the non-linear Trautman boundary-value theory is also displayed.

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Gravitational Waves

Sakellariadou

2021

Modified Gravity and Cosmology

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Quantum gravity and gravitational-wave astronomy

Abstract: We investigate possible signatures of quantum gravity which could be tested 8 Strain noise and quantum gravity 44 9 Conclusions 46 A Anomalous scaling of the Green function 48

Cited by 70 publications

References 253 publications

Gravitational-wave luminosity distance in quantum gravity

Gravitational-wave luminosity distance in quantum gravity

The Wave-Front Equation of Gravitational Signals in Classical General Relativity

Gravitational Waves

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