Chameleon effect in the Jordan frame of the Brans-Dicke theory

Quirós, Israel; García-Salcedo, Ricardo; González, Tamé; Horta-Rangel, Francisco Antonio

doi:10.1103/physrevd.92.044055

Cited by 12 publications

(9 citation statements)

References 74 publications

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“…In addition to the CC and SN data sets, we also consider the impact of priors on the Hubble constant in the CBD MCMC analyses. In the constraint analyses, we consider three scenarios: (i) The combined CC and SN data sets without any prior on H0 which gives the result of purely observational data; (ii) we add the latest SH0ES local estimate (Riess et. al.…”

Section: Direct Implementation Of Mcmc and Estimation Of Model Parame...mentioning

confidence: 99%

“…We find motivation in a theory where the scalar, apart from its self-interaction, has interaction with ordinary matter as well. We call the theory a generalized Chameleon-Brans-Dicke (CBD) theory and give it's basic formalism in both Einstein and Jordan frames, employing a suitable conformal transformation following the standard literature (Jarv, Kuusk, Saal and Vilson 2015;Quiros et al 2015). In the process, the scalar interaction in the Einstein Frame is modified beyond the standard conformal coupling with matter and leads to modification of gravitational interaction in small scale as well as large scale structure formations.…”

Section: Introductionmentioning

confidence: 99%

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Screening Mechanism and Late-time Cosmology: Role of a Chameleon-Brans-Dicke Scalar Field

Chakrabarti,

Dutta,

Said

2022

Preprint

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We discuss a way in which the geometric scalar field in a Brans-Dicke theory can evade local astronomical tests and act as a driver of the late-time cosmic acceleration. This requires a self-interaction of the Brans-Dicke scalar as well as an interaction with ordinary matter. The scalar field in this construct acquires a density-dependent effective mass much like a Chameleon field. We discuss the viability of this setup in the context of Equivalence Principle, Fifth Force and Solar System tests. The cosmological consistency is adjudged in comparison with observational data from recalibrated light-curves of type Ia supernova (JLA), the Hubble parameter measurements (OHD) and the Baryon Acoustic Oscillation (BAO). We deduct that the astrophysical constraints indeed favour the existence of a mild scalar-matter interaction in the Jordan Frame.

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Section: Direct Implementation Of Mcmc and Estimation Of Model Parame...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Screening Mechanism and Late-time Cosmology: Role of a Chameleon-Brans-Dicke Scalar Field

Chakrabarti,

Dutta,

Said

2022

Preprint

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“…STT-s are a generalization of the BD theory where the coupling parameter is a function of the scalar field: ω BD → ω(φ), i. e., it is a varying parameter. The need for a generalization of BD theory comes from the tight constraints on ω BD that the solar system experiments have established [40], although these constraints are smoothed out by the chameleon mechanism in BD theories with a self-interacting scalar field [41][42][43]. If ω BD were a varying coupling then the latter experimental constraints may be avoided or, at least, alleviated.…”

Section: Introductionmentioning

confidence: 99%

Global asymptotic dynamics of the cubic galileon interacting with dark matter

Arcia¹,

Quirós²,

Nucamendi³

et al. 2022

Preprint

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In this paper we perform a thorough dynamical systems analysis of the cubic galileon model nonminimally coupled to the dark matter. Three well-known classes of interacting models are considered where the energy exchange between the dark components is a linear function of the dark matter density and of the dark energy density: Q1 = 3αHρm, Q2 = 3βρm φ and Q3 = 3ǫHρ φ , respectively. We are able to show the global asymptotic dynamics of the model for the exponential potential in a homogeneous and isotropic background. The cosmological implications of the proposed scenarios are explored and it is found that, in addition to the appearance of new equilibrium configurations that do not appear neither in the non-interacting cubic galileon model nor in the interacting quintessence model, there is a significant impact of the non-minimal coupling through modification of the stability properties of the critical points. The resulting cosmological scenario provides a bigbang origin of the cosmic expansion, an early transient stage of inflationary expansion, as well as matter-scaling late time stable state of the universe, among other solutions of lesser cosmological interest. This work extends previous studies of coupled dark energy to a broader class of gravitational theories.

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“…From cosmological studies, it has been found that while a theory can provide an acceleration phase in one frame it may not be able to do so in the other. From this it is clear the conformal equivalence transformation between the two frames does not necessarily mean physical equivalence; see also the discussions in [34,[38][39][40][41][42][43][44][45] and references therein. The study of the physical properties between the Jordan and the Einstein frame has been extended to astrophysical objects, such as black-holes [46][47][48][49][50] or to even more exotic configurations like the wormholes [51][52][53] and the black branes or strings [54,55].…”

Section: Introductionmentioning

confidence: 99%

Black branes in four-dimensional conformal equivalent theories

2018

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The physical properties of static analytic solutions which describe black brane geometries are discussed. In particular we study the similarities and differences of analytic black brane/string solutions in the Einstein and Jordan frames. The comparison is made between vacuum power law f (R) gravity solutions and their conformal equivalents in the Einstein frame. In our analysis we examine how the geometrical and physical properties of these analytic axisymmetric solutions -such as singularities, the temperature and the entropy -are affected as we pass from one frame to the other. The Brans-Dicke action with ω BD = 0 is also known as O'Hanlon gravity.

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Chameleon effect in the Jordan frame of the Brans-Dicke theory

Cited by 12 publications

References 74 publications

Screening Mechanism and Late-time Cosmology: Role of a Chameleon-Brans-Dicke Scalar Field

Screening Mechanism and Late-time Cosmology: Role of a Chameleon-Brans-Dicke Scalar Field

Global asymptotic dynamics of the cubic galileon interacting with dark matter

Black branes in four-dimensional conformal equivalent theories

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