Cosmology in Scalar-Tensor Gravity

By Valerio Faraoni. 2004

789 citations recorded by the source corpus.

Subfields: Astronomy and Astrophysics, Oceanography

View Paper: https://www.semanticscholar.org/paper/5ffcb308f08caf5812d6b65f5fdd4d1e0cd716fb

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Citations in the corpus

Stability of modified gravity models (2005, background): “ eﬀective energy–momentum tensor of the scalar ﬁeld appearing in the left hand side of the ﬁeld equations of scalar–tensor gravity when these are written in the form Gab = 8πT (eff) ab [φ] (see Refs. [39, 40] for a discussion). The stability condition with respect to homogeneous perturbations can be”
f(R) gravity and scalar–tensor theory (2006, background): “rforms a conformal transformation along Φ = R, together with the scalar ﬁeld redeﬁnition Φ = exp( p 3κ/2ϕ), one can arrive to an action describing Einstein gravity, minimally coupled to a scalar ﬁeld [25, 12]: Smet = Z d4x p −gE RE 2κ − 1 2 (∇ϕ)2 − V(ϕ) +SM(gE µν/Φ(ϕ),ψ), (14) where RE is the Ricc”
Extra force in f(R) modified theories of gravity (2007, background): “In the absence of the coupling, one verifies the conservation of the energy-momentum tensor [31], which can also be verified from the diffeomorphism invariance of the matter part of the action [24, 32, 33].”
Interacting holographic dark energy in Brans–Dicke theory (2009, background): “On the other side, scalar-tensor theories of gravity have been widely applied in cosmology [17].”
Primordial bispectrum from multifield inflation with nonminimal couplings (2012, result): “As in previous studies of non-Gaussianities in multifield models, our results for the bispectrum depend sensitively on the fields’ initial conditions.”
Metric-affine f(R) theories of gravity (2006, background): “Scalar tensor theories [10] and the Einstein–Cartan formulation [11] are just two examples of a very broad variety of models.”
f(R, T) Gravity (2011, background): “Scalar fields are supposed to play a fundamental role in physics and cosmology [28].”
f(R,T) Cosmological Models in Phase Space (2013, background): “, the Brans–Dicke theory [5] and higher–order/modified gravities [2, 6–12].”
Dynamical systems applied to cosmology: Dark energy and modified gravity (2017, background): “Halliwell (1987); Faraoni & Protheroe (2013). The EN variables (4.”
Extreme gravity tests with gravitational waves from compact binary coalescences: (I) inspiral–merger (2018, methodology): “et al. [52] (see also [316,317]). In the notation used above, and correcting a mistake in [52], they found that the lowest-order ux is given by E_ = 4 3 r Gm r 3 S2 s !2 2m s !2 =2 (! m); (44) where !is the binary’s orbital frequency, ms is the mass of the scalar eld, and is the Heaviside functi”
f(R,Lm) gravity (2010, background): “highly constrained by solar system experimental tests [23, 24].”
Generalized Curvature-Matter Couplings in Modified Gravity (2014, methodology): “Amongst other features, these models allow for an explicit breaking of the equivalence principle (EP), which is highly constrained by Solar System experimental tests [17,18], by imposing a matter-dependent deviation from geodesic motion.”
f(R) Theories Of Gravity (2008, background): “…by rewriting the field equations of alternative gravities as effective Einstein equations do, in general, violate all the energy conditions [e.g., (Faraoni, 2004a)].15 Also, the concept of gravitational energy density is, anyway, ill-defined in GR and in all metric theories of gravity as a…”
Pseudo)issue of the conformal frame revisited (2006, background): “ V 2φ g ab + 1 φ (∇ a∇ bφ− g ab φ) , (4.4) is often identiﬁed with an eﬀective stress-energy tensor of the scalar φ. There are three possible ways of identifying an eﬀective stress-energy tensor for φ[28, 29] and the choice 17 of eq. (4.4) has sometimes been criticized in the literature [30, 29, 31]”