Testing nonlocal gravity with Lunar Laser Ranging

Belgacem, Enis; Finke, Andreas; Frassino, Antonia Micol; Maggiore, Michele

doi:10.1088/1475-7516/2019/02/035

Cited by 50 publications

(85 citation statements)

References 84 publications

(229 reference statements)

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“…However, Ref. [25] pointed out that X was negative definite without the expected screening mechanism, which contradicted the assumption in [23]. In order to avoid this question, Deser and Woodard proposed a new nonlocal model [26], called DW-2019 model.…”

Section: Introductionmentioning

confidence: 99%

Structure formation in the new Deser-Woodard nonlocal gravity model

Ding

Deng

2019

J. Cosmol. Astropart. Phys.

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We consider the structure formation in the nonlocal gravity model proposed recently by Deser and Woodard (DW-2019 model), which can not only reproduce the ΛCDM cosmology without fine-tuning puzzle but also may provide a screening mechanism for free. By using the direct numerical method of the reconstructing technique, the nonlocal distortion153(Y −16.97) which has a small deviation with the fitted function proposed by Deser and Woodard. Based on the numerical results, we plotted the curve of the growth rate f σ 8 (z) under DW-2019 model, which shows this model is notruled out by the f σ 8 data from the Redshift-space distortions measurements. Since the source of the nonlocal scalar Y is defined as the quadratic term about the nonlocal scalar −1 R, the first-order perturbation of Y disappears. And this causes that the evolution of f σ 8 has an unnatural plummet at z 0.39, which implies that a potential phase transition appears. Finally, the qualitative analysis of the possible screening mechanism is discussed, and DW-2019 model will not be ruled out by Lunar Laser Ranging. *

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Section: Introductionmentioning

confidence: 99%

Structure formation in the new Deser-Woodard nonlocal gravity model

Ding

Deng

2019

J. Cosmol. Astropart. Phys.

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“…This is due to the fact that we must impose a matching condition for the scalar field at the surface Σ, and in this way the field inherits a time dependence even in the inner region. For the RR model, a detailed analysis of the solution for the scalar field S in a background that interpolates between the static solution at short distances and FRW at large distances has been performed in [161]. A useful way of studying the problem is to follow the time evolution of the auxiliary fields U and S of the RR model, starting before the epoch of structure formation.…”

Section: Limits On Time Variation Of G Eff From Lunar Laser Rangingmentioning

confidence: 99%

Gravity in the infrared and effective nonlocal models

Belgacem

Dirian

Finke

et al. 2020

J. Cosmol. Astropart. Phys.

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We provide a systematic and updated discussion of a research line carried out by our group over the last few years, in which gravity is modified at cosmological distances by the introduction of nonlocal terms, assumed to emerge at an effective level from the infrared behavior of the quantum theory. The requirement of producing a viable cosmology turns out to be very stringent and basically selects a unique model, in which the nonlocal term describes an effective mass for the conformal mode. We discuss how such a specific structure could emerge from a fundamental local theory of gravity, and we perform a detailed comparison of this model with the most recent cosmological datasets, confirming that it fits current data at the same level as ΛCDM.Most notably, the model has striking predictions in the sector of tensor perturbations, leading to a very large effect in the propagation of gravitational wave (GWs) over cosmological distances. At the redshifts relevant for the next generation of GW detectors such as Einstein Telescope, Cosmic Explorer and LISA, this leads to deviations from GR that could be as large as 80%, and could be verified with the detection of just a single coalescing binary with electromagnetic counterpart. This would also have potentially important consequences for the search of the counterpart since, for a given luminosity distance to the source, as inferred through the GW signal, the actual source redshift could be significantly different from that predicted by ΛCDM. At the redshifts relevant for advanced LIGO/Virgo/Kagra the effect is smaller, but still potentially observable over a few years of runs at target sensitivity. arXiv:2001.07619v1 [astro-ph.CO] 21 Jan 2020 4 Conclusions 66 A Difficulties of alternative nonlocal models 68 -1 -2 The Lichnerowicz operator is defined by E µν,ρσ ≡ 1 2, where 2 = η µν ∂µ∂ν is the flat-space d'Alembertian. We use the signature ηµν = (−, +, +, +) and MTW [14] sign conventions. 3 We assume here 3 + 1 spacetime dimensions. See [13] for the corresponding equations in d + 1 spacetime dimensions, with d generic.

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“…[49,52] for reviews of the model, and refs. [52][53][54][55][56][57][58] for further related work). For all values ∆N , the predictions for d gw L (z)/d em L (z) are very accurately reproduced by eq.…”

Section: Gaussian Processes Versus Explicit Parametrizationsmentioning

confidence: 99%

Gaussian processes reconstruction of modified gravitational wave propagation

et al. 2020

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Recent work has shown that modified gravitational wave (GW) propagation can be a powerful probe of dark energy and modified gravity, specific to GW observations. We use the technique of Gaussian processes, that allows the reconstruction of a function from the data without assuming any parametrization, to measurements of the GW luminosity distance from simulated joint GW-GRB detections, combined with measurements of the electromagnetic luminosity distance by simulated DES data. For the GW events we consider both a second-generation LIGO/Virgo/Kagra (HVLKI) network, and a third-generation detector such as the Einstein Telescope. We find that the HVLKI network at target sensitivity, with O(15) neutron star binaries with electromagnetic counterpart, could already detect deviations from GR at a level predicted by some modified gravity models, and a third-generation detector such as ET would have a remarkable discovery potential. We discuss the complementarity of the Gaussian processes technique to the (Ξ0, n) parametrization of modified GW

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Testing nonlocal gravity with Lunar Laser Ranging

Cited by 50 publications

References 84 publications

Structure formation in the new Deser-Woodard nonlocal gravity model

Structure formation in the new Deser-Woodard nonlocal gravity model

Gravity in the infrared and effective nonlocal models

Gaussian processes reconstruction of modified gravitational wave propagation

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