Constraints on Einstein-aether theory after GW170817

Oost, Jacob; Mukohyama, Shinji; Wang, Anzhong

doi:10.1103/physrevd.97.124023

Cited by 134 publications

(128 citation statements)

References 52 publications

(96 reference statements)

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“…[96,97,318,319], the Kinetic Gravity Braiding model [93], the shift symmetric GLPV model [274], the tracking and scaling DHOST theories discussed in Ref. [320], Einstein Aether theory [321] and low-energy Hořava gravity [269,268]. For a complete review about viable models after GW170817 see Ref.…”

Section: Gw170817 and Grb170817amentioning

confidence: 99%

Effective field theory of dark energy: A review

2020

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The discovery of cosmic acceleration has triggered a consistent body of theoretical work aimed at modeling its phenomenology and understanding its fundamental physical nature. In recent years, a powerful formalism that accomplishes both these goals has been developed, the so-called effective field theory of dark energy. It can capture the behavior of a wide class of modified gravity theories and classify them according to the imprints they leave on the smooth background expansion history of the Universe and on the evolution of linear perturbations. The effective field theory of dark energy is based on a Lagrangian description of cosmological perturbations which depends on a number of functions of time, some of which are non-minimal couplings representing genuine deviations from standard gravity. Such a formalism is thus particularly convenient to fit and interpret the wealth of new data that will be provided by future galaxy surveys. Despite its recent appearance, this formalism has already allowed a systematic investigation of what lies beyond the standard gravity landscape and provided a conspicuous amount of theoretical predictions and observational results. In this review, we report on these achievements. Conclusion and outlook 94Appendix A Acronyms and symbols 971. Scalar-tensor theoriesà la Brans-Dicke, hereafter dubbed Generalized

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Section: Gw170817 and Grb170817amentioning

confidence: 99%

Effective field theory of dark energy: A review

2020

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“…Various implications of this kind of theories are explored in cosmological contexts such as cosmological perturbations [39,40], the effects of the parity violation in the gravitational waves [41,42], and the inflation in the early universe [39,[43][44][45]. Moreover the astrophysical constraints on the coupling parameters of the theory are also studied with the data of the gravitational wave events GW170817 and GRB 170817A [46]. The laws of black hole thermodynamics and the analysis of cosmic censorship conjecture involving the existence universal horizons during gravitational collapse have been investigated in [47].…”

Section: Introductionmentioning

confidence: 99%

Shadows and deflection angle of charged and slowly rotating black holes in Einstein-Æther theory

et al. 2019

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In this paper, we study the shadow cast by two types of charged and slowly rotating black holes in Eisntein-AEther theory of gravity. This two types of black holes are corresponding to two specific combinations of the coupling constants of the aether field, i.e., c14 = 0 but c123 = 0 for the first type and c123 = 0 for the second type, respectively. For both types of black holes, in addition to the mass and charge of the black holes, we show that the presence of the aether field can also affect the size of the shadow. For the first type black hole, it is shown that the shadow size increases with the parameter c13, while for the second type black hole, the shadow size still increases with c13 but decreases with the parameter c14. With these properties of these aether parameters, we also discuss the observational constraints on these parameters by using the data of the first black hole image by the Event Horizon Telescope. In addition, we also explore the effect of the aether field on the the deflection angle of light and the time delay by using the Gauss-Bonnet theorem. It is shown that, for a specific combination c123 = 0, the deflection angle/time delay is slightly affected by the aether parameter c13 at the leading order. *

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“…In this coordinate system the vector field has components A 0 = −e −φ 0 (1 +Ψ) and A i = 0. Using the metric transformation (2) we find the components of the metric g µν so 1 Other single-metric theories such as the Horndeski theory studied in [9][10][11][12][13] and Einstein-Aether theory studied in [14] may also yield Shapiro time delay different than the one in GR.…”

Section: Introductionmentioning

confidence: 99%

Gravitational alternatives to dark matter with tensor mode speed equaling the speed of light

Skordis

Złośnik

2019

Phys. Rev. D

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A number of theories of gravity have been proposed as proxies for dark matter in the regime of galaxies and cosmology. The recent observations of gravitational waves (GW170817) from the merger of two neutron stars, followed by an electromagnetic counterpart (GW170817a) have placed stringent constraints on the difference of the speed of gravity to the speed of light, severely restricting the phenomenological viability of such theories. We revisit the impact of these observations on the Tensor-Vector-Scalar (TeVeS) paradigm of relativistic Modified Newtonian Dynamics (MOND) and demonstrate the existence of a previously unknown class of this paradigm where the speed of gravity always equals the speed of light. We show that this holds without altering the usual (bimetric) MOND phenomenology in galaxies.

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Constraints on Einstein-aether theory after GW170817

Cited by 134 publications

References 52 publications

Effective field theory of dark energy: A review

Effective field theory of dark energy: A review

Shadows and deflection angle of charged and slowly rotating black holes in Einstein-Æther theory

Gravitational alternatives to dark matter with tensor mode speed equaling the speed of light

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