Dynamics of scalar perturbations in f(R, T) gravity [Phys. Rev. D 87, 103526 (2013), publisher's note]

By F. G. Alvarenga, A. D. L. C. Dombriz, M. Houndjo, M. Rodrigues, Diego Sáez-Chillón Gómez. 2013

250 citations recorded by the source corpus.

In the context of f(R, T) theories of gravity, we study the evolution of scalar cosmological perturbations in the metric formalism. According to restrictions on the background evolution, a specific model within these theories is assumed in order to guarantee the standard continuity equation. Using a completely general procedure, we find the complete set of differential equations for the matter density perturbations. In the case of sub-Hubble modes, the density contrast evolution reduces to a second-order equation. We show that for well-motivated f(R, T) Lagrangians the quasistatic approximation yields to very different results from the ones derived in the frame of the concordance Lambda CDM model constraining severely the viability of such theories.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/f57b8630ffd07796963ee9487c422aa975a75f50

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Citations in the corpus

Cosmological and Solar System Consequences of f(R,T) Gravity Models (2014, background): “Since the introduction of this theory, its numerous aspects have been investigated, such as thermodynamics properties [69–72], energy conditions [73–75], cosmological solutions based on a homogeneous and isotropic space–time through a phase–space analysis [76], anisotropic cosmology [77–79], a wormh”
f(R,T) Cosmological Models in Phase Space (2013, background): “Up to now, the issues which have been investigated along with this modified theory are the energy conditions [65], the thermodynamics [66–68], anisotropic cosmology [69], the cosmology in which the representation employs an auxiliary scalar field [64], the reconstruction of some cosmological models ”
Generalized Curvature-Matter Couplings in Modified Gravity (2014, methodology): “[130]. In [131], the speciﬁc case of the conservation of the energy-momentum tensor was considered, and cosmological solutions were obtained for an homogeneous and isotropic model of the universe. In [132], the evolution of scalar cosmological perturbations in the metric formalism were analysed. Acc”