Breaking of Vainshtein screening in scalar-tensor theories beyond Horndeski

Kobayashi, Tsutomu; Watanabe, Yuki; Yamauchi, Daisuke

doi:10.1103/physrevd.91.064013

Cited by 160 publications

(174 citation statements)

References 58 publications

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“…The Vainshtein mechanism with a time-dependent scalar has been considered in [26,46], while Ref. [47] studied it in a subclass of beyond Horndeski theories (with L (5,0) = L (5,1) = Λ bare = 0).…”

Section: Schwarzschild-de Sitter Solutionsmentioning

confidence: 99%

Cosmological self-tuning and local solutions in generalized Horndeski theories

Babichev

Esposito-Farèse

2017

Phys. Rev. D

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We study both the cosmological self-tuning and the local predictions (inside the Solar system) of the most general shift-symmetric beyond Horndeski theory. We first show that the cosmological self-tuning is generic in this class of theories: By adjusting a mass parameter entering the action, a large bare cosmological constant can be effectively reduced to a small observed one. Requiring then that the metric should be close enough to the Schwarzschild solution in the Solar system, to pass the experimental tests of general relativity, and taking into account the renormalization of Newton's constant, we select a subclass of models which presents all desired properties: It is able to screen a big vacuum energy density, while predicting an exact Schwarzschild-de Sitter solution around a static and spherically symmetric source. As a by-product of our study, we identify a general subclass of beyond Horndeski theory for which regular self-tuning black hole solutions exist, in presence of a time-dependent scalar field. We discuss possible future development of the present work.

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Section: Schwarzschild-de Sitter Solutionsmentioning

confidence: 99%

Cosmological self-tuning and local solutions in generalized Horndeski theories

Babichev

Esposito-Farèse

2017

Phys. Rev. D

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“…Among all them, we have decided to focus on the Vainshtein screening partially-driven and/or partially-broken (first discovered by [63] and further discussed in [91]) by the so-called galileon fields which, as pointed out in [65], are only the most common approach for it, but not the only one. Galileon fields are so defined because, by construction, they are invariant under the galilean shift symmetry…”

Section: Introductionmentioning

confidence: 99%

Breaking the Vainshtein screening in clusters of galaxies

et al. 2017

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In this work we will test an alternative model of gravity belonging to the large family of galileon models. It is characterized by an intrinsic breaking of the Vainshtein mechanism inside large astrophysical objects, thus having possibly detectable observational signatures. We will compare theoretical predictions from this model with the observed total mass profile for a sample of clusters of galaxies. The profiles are derived using two complementary tools: X-ray hot intra-cluster gas dynamics, and strong and weak gravitational lensing. We find that a dependence with the dynamical internal status of each cluster is possible; for those clusters which are very close to be relaxed, and thus less perturbed by possible astrophysical local processes, the galileon model gives a quite good fit to both X-ray and lensing observations. Both masses and concentrations for the dark matter halos are consistent with earlier results found in numerical simulations and in the literature, and no compelling statistical evidence for a deviation from general relativity is detectable from the present observational state. Actually, the characteristic galileon parameter Υ is always consistent with zero, and only an upper limit ( 0.086 at 1σ, 0.16 at 2σ, and 0.23 at 3σ) can be established. Some interesting distinctive deviations might be operative, but the statistical validity of the results is far from strong, and better data would be needed in order to either confirm or reject a potential tension with general relativity.PACS numbers: 04.50. Kd, 98.80.Es, 95.35. + d

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“…A review of the effective field theory of the inflation/dark energy and the Horndeski's theory was presented in Tsujikawa (2015). In 2015, several pioneering works beyond Horndeski were presented in (Geyzes et al 2015;Kobayashi et al 2015;De Felice et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Exact scalar-tensor cosmological solutions via Noether symmetry

Belinchón

Harkó

Mak

2016

Astrophys Space Sci

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In this paper, we investigate the Noether symmetries of a generalized scalar-tensor, Brans-Dicke type cosmological model, in which we consider explicit scalar field dependent couplings to the Ricci scalar, and to the scalar field kinetic energy, respectively. We also include the scalar field self-interaction potential into the gravitational action. From the condition of the vanishing of the Lie derivative of the gravitational cosmological Lagrangian with respect to a given vector field we obtain three cosmological solutions describing the time evolution of a spatially flat Friedman-RobertsonWalker Universe filled with a scalar field. The cosmological properties of the solutions are investigated in detail, and it is shown that they can describe a large variety of cosmological evolutions, including models that experience a smooth transition from a decelerating to an accelerating phase.

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Breaking of Vainshtein screening in scalar-tensor theories beyond Horndeski

Cited by 160 publications

References 58 publications

Cosmological self-tuning and local solutions in generalized Horndeski theories

Cosmological self-tuning and local solutions in generalized Horndeski theories

Breaking the Vainshtein screening in clusters of galaxies

Exact scalar-tensor cosmological solutions via Noether symmetry

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