Late time cosmological solutions in $f(R,T)$ gravity in a viscous Universe

Abstract

Considering the condition on conservation of energy momentum tensor (EMT), we study late time cosmological solutions in the context of $f(R,T)=R+\alpha T^n$ gravity (where $\alpha$ and $n$ are constants) in a flat FLRW spacetime. The present model discusses the case of a barotropic perfect fluid as the matter content of the Universe, along with the case when dissipative effects are taken into account. Briefly, assuming a single perfect fluid we find that the mentioned model is not capable of presenting an observationally consistent picture of the late time accelerated expansion of the Universe; nevertheless, the model leads to admissible solutions when the bulk viscosity is included. In this regard, a consistent setting is found considering the Eckart, Truncated and Full Israel-Stewart theories which determine the behavior of bulk viscosity. In the presence of bulk viscosity, the behavior of the deceleration parameter (DP) shows that the underlying model can describe an acceptable evolution even if the isotropic pressure of matter content of the Universe is negligible.

18 pages and 7 figures

References in corpus (21)

• f(R,T) gravity
• Spectra and Light Curves of Six Type Ia Supernovae at 0.511 < z < 1.12 and the Union2 Compilation
• Hubble parameter measurement constraints on the redshift of the deceleration-acceleration transition, dynamical dark energy, and space curvature
• Thermodynamic interpretation of the generalized gravity models with geometry - matter coupling
• Modelling wormholes in $f(R,T)$ gravity
• Dark Matter From f(R,T) Gravity
• Does Bulk Viscosity Create a Viable Unified Dark Matter Model?
• Cosmological solutions from Induced Matter Model applied to 5D f(R,T) gravity and the shrinking of the extra coordinate
• Friedmann model with viscous cosmology in modified $f(R,T)$ gravity theory
• Dark matters on the scale of galaxies
• Junction conditions and thin-shells in perfect-fluid $f\left(R,T\right)$ gravity
• Viscous Dark Cosmology with Account of Quantum Effects
• Limits on $f(R,T)$ Gravity from Earth's Atmosphere
• Accelerated and decelerated expansion in a causal dissipative cosmology
• Late time cosmological approach in mimetic $f(R,T)$ gravity
• Viscous dark energy and generalized second law of thermodynamics
• Unimodular $f(R,T)$ Gravity
• Stability of Einstein-Aether Cosmological Models
• A cosmographic analysis of the transition to acceleration using SN-Ia and BAO
• A hybrid model of viscous and Chaplygin gas to tackle the Universe acceleration
• The galaxy rotation curves in the $f(R,T)$ modified gravity formalism