Dark matter, time-varying<i>G</i>, and a dilaton field

Damour, Thibault; Gibbons, G. W.; Gundlach, Carsten

doi:10.1103/physrevlett.64.123

Cited by 386 publications

(391 citation statements)

References 14 publications

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“…An oft-used alternative due to Damour et al [4] is to postulate that Ω −2 ∂ ν Ω 2 from the latter two equations is different from that of the first. This allows coupling to the dark sector to be less constrained than coupling to the visible sector.…”

Section: Matter-dark Energy Couplingmentioning

confidence: 99%

“…the parameter |ξ| 16πG 3 must be less than 0.032 to be consistent with radar delay experiments [4,22].…”

Section: Matter-dark Energy Couplingmentioning

confidence: 99%

“…Particle physics experiments and astrophysical observations put severe limits on the non-conservation of normal baryonic matter, so Section IX describes various ways to avoid these constraints. One way, devised by Damour et al [4], is to couple the scalar field only to dark matter with an interaction mediated by the time-derivative of the scalar field multiplied by the energy density of dark matter. The modern version of this model is called the Coupled Quintessence Model.…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the alternative theory of gravity is taken to be the Brans-Dicke theory [3] (the simplest and best-motivated extension of general relativity relativity), in which Newton's constant is re-interpreted as a time-varying scalar field [4]. Amendola and various co-authors [5] [6], as well as other groups (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Conformal transformations and accelerated cosmologies

Crooks

Frampton

2006

Phys. Rev. D

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A cosmological theory that predicts a late-time accelerated attractor with a constant dark matter to dark energy ratio can be said to solve the Coincidence Problem. Such cosmologies are naturally generated in the context of non-standard gravity theories under conformal transformation because of the resulting couplings between scalar fields and matter. The present work examines four classes of these transformed theories and finds that only a small subset-those with a single scalar field-are capable of solving the Coincidence Problem.

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Section: Matter-dark Energy Couplingmentioning

confidence: 99%

“…the parameter |ξ| 16πG 3 must be less than 0.032 to be consistent with radar delay experiments [4,22].…”

Section: Matter-dark Energy Couplingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Conformal transformations and accelerated cosmologies

Crooks

Frampton

2006

Phys. Rev. D

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“…A dynamical equation of state ( EoS) parameter that is connected directly to the evolution of the energy density in the universe and indirectly to the expansion of the Universe can be regarded as a suitable parameter to explain the acceleration and the origin of DE [10]- [11]. In scalar-tensor theories [12]- [19], interaction of the scalar field with matter ( for example in chameleon cosmology) [20]- [25] or with geometry in Brans-Dicke (BD) cosmological models [26]- [30] can be used to interpret the late time acceleration.…”

Section: Introductionmentioning

confidence: 99%

Observational constraints in scalar tensor theory with tachyonic potential

Farajollahi

Salehi

Shahabi

2011

J. Cosmol. Astropart. Phys.

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We study the dynamics of the scalar tensor cosmological model in the presence of tachyon field.In an alternative approach, in two exponential and power law form of the scalar field functions in the model, field equations are solved by simultaneously best fitting the model parameters with the most recent observational data. This approach gives us an observationally verified interpretation of the dynamics of the universe. We then discuss the best fitted of equation of state parameter, the statefinder parameters and the reconstructed scalar field in the model.

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Multiple dark matter as a self‐regulating mechanism for dark sector interactions

Baldi

2012

Annalen der Physik

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A wide range of astrophysical and cosmological observations support the evidence that the energy density of the Universe is presently largely dominated by particles and fields that do not belong to the standard model of particle physics. Such cosmic dark sector appears to be made of two distinct entities capable to account for the growth of large-scale structures and for the observed acceleration of the expansion rate of the Universe, respectively dubbed dark matter and dark energy. Nevertheless, the fundamental nature of these two dark components has so far remained mysterious. In the currently accepted scenario dark matter is associated to a single new massive and weakly interacting particle beyond the standard model, while dark energy is assumed to be a simple cosmological constant. However, present cosmological constraints and the absence of a direct detection and identification of any dark matter particle candidate leave room to the possibility that the dark sector of the Universe be actually more complex than it is normally assumed. In particular, more than one new fundamental particle could be responsible for the observed dark matter density in the Universe, and possible new interactions between dark energy and dark matter might charac-*

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Dark matter, time-varyingG, and a dilaton field

Cited by 386 publications

References 14 publications

Conformal transformations and accelerated cosmologies

Conformal transformations and accelerated cosmologies

Observational constraints in scalar tensor theory with tachyonic potential

Multiple dark matter as a self‐regulating mechanism for dark sector interactions

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