F(R) cosmology in presence of a phantom fluid and its scalar-tensor counterpart:towards a unified precision model of the universe evolution

Abstract

The behavior of cosmological evolution is studied in the case when a phantom fluid, that contributes to the universe accelerated expansion, is introduced in an F (R) model. At the early stages of the universe history, the dark fluid is seen to give rise to a deceleration of its expansion. For t close to present time it works as an additional contribution to the effective cosmological constant and, later, it produces the transition to a phantom era, which could actually be taking place right now in some regions of the cosmos, and might have observable consequences. For t close to the Rip time, the universe becomes completely dominated by the dark fluid, whose equation of state is phantom-like at that time. Our model, which is able to reproduce the dark energy period quite precisely, may still be modified in such a way that the epoch dominated by an effective cosmological constant, produced by the F (R) term and by the dark fluid contribution, becomes significantly shorter, what happens when a matter term is included. The dark fluid with phantom behavior gives rise to a super-accelerated phase, as compared with the case where just the viable F (R) term contributes. It is also seen explicitly that an F (R) theory can be constructed from a phantom model in a scalar-tensor theory, in which the scalar field does not behave as phantom (in the latter case the action for F (R) would be complex). Promising F (R) models which can cross the phantom divide in a convenient way are constructed explicitly.

13 pages, 4 figures. Version published in PRD

References in corpus (22)

• Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
• Improved Cosmological Constraints from New, Old and Combined Supernova Datasets
• Disappearing cosmological constant in f(R) gravity
• Class of viable modified $f(R)$ gravities describing inflation and the onset of accelerated expansion
• Cosmological viability of f(R)-gravity as an ideal fluid and its compatibility with a matter dominated phase
• Unifying inflation with LambdaCDM epoch in modified f(R) gravity consistent with Solar System tests
• Modified f(R) gravity unifying R^m inflation with \LambdaCDM epoch
• Observational signatures of f(R) dark energy models that satisfy cosmological and local gravity constraints
• The pattern of growth in viable f(R) cosmologies
• Limit to General Relativity in f(R) theories of gravity
• Solar system and equivalence principle constraints on f(R) gravity by chameleon approach
• Phantom scalar dark energy as modified gravity: understanding the origin of the Big Rip singularity
• The future evolution and finite-time singularities in $F(R)$-gravity unifying the inflation and cosmic acceleration
• Dark Energy: the equation of state description versus scalar-tensor or modified gravity
• Reconstructing the universe history, from inflation to acceleration, with phantom and canonical scalar fields
• Newton law corrections and instabilities in $f(R)$ gravity with the effective cosmological constant epoch
• Crossing of the phantom divide in modified gravity
• Initial and final de Sitter universes from modified $f(R)$ gravity
• Modified f(R) gravity from scalar-tensor theory and inhomogeneous EoS dark energy
• Relaxing a large cosmological constant
• The solution of the cosmological constant problem from the inhomogeneous equation of state - a hint from modified gravity?
• Oscillating Universe from inhomogeneous EoS and coupled dark energy

Cited by in corpus (50)

• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• Modified Gravity Theories on a Nutshell: Inflation, Bounce and Late-time Evolution
• Accelerating universe from F(T) gravity
• Black holes, cosmological solutions, future singularities, and their thermodynamical properties in modified gravity theories
• f(R, T, R_μνT^μν) gravity phenomenology and ΛCDM universe
• LambdaCDM epoch reconstruction from F(R,G) and modified Gauss-Bonnet gravities
• Viscous Cosmology for Early- and Late-Time Universe
• On the stability of the cosmological solutions in f(R,G) gravity
• On neutron stars in f(R) theories: small radii, large masses and large energy emitted in a merger
• On the $\Lambda$CDM Universe in $f(G)$ gravity
• Dynamical Systems Perspective of Cosmological Finite-time Singularities in $f(R)$ Gravity and Interacting Multifluid Cosmology
• Analyzing the $H_0$ tension in $F(R)$ gravity models
• Finite-time Cosmological Singularities and the Possible Fate of the Universe
• Cosmic history of viable exponential gravity: Equation of state oscillations and growth index from inflation to dark energy era
• Is exponential gravity a viable description for the whole cosmological history?
• Unifying inflation with dark energy in modified F(R) Horava-Lifshitz gravity
• A special exact spherically symmetric solution in f(T) gravity theories
• Cosmological Fluids with Logarithmic Equation of State
• A Built-in Inflation in the $f(T)$-Cosmology
• Reconstruction of $\Lambda$CDM Universe in $f(Q)$ Gravity
• Phantom fluid supporting traversable wormholes in alternative gravity with extra material terms
• The mass-radius relation for neutron stars in $f(R)=R+\alpha R^2$ gravity: a comparison between purely metric and torsion formulations
• Correspondence of cosmology from non-extensive thermodynamics with fluids of generalized equation of state
• Theoretical and observational constraints of viable f(R) theories of gravity
• Spherically Symmetric Solutions on a Non-Trivial Frame in f(T) Theories of Gravity
• Schwarzschild solution in extended teleparallel gravity
• Inflation in mimetic f(G) gravity
• Spotting deviations from R^2 inflation
• A Study of Finite-time Singularities of Loop Quantum Cosmology Interacting Multifluids
• Testing logarithmic corrections on $R^2$-exponential gravity by observational data
• Focusing of geodesic congruences in an accelerated expanding Universe
• Scalar-tensor representation of $f(R)$ gravity and Birkhoff's theorem
• Cosmological reconstruction and energy bounds in $f(R,R_{\alpha \beta }{R}^{\alpha \beta },\varphi )$ gravity
• Cosmological evolution, future singularities, Little Rip and Pseudo-Rip in viable f(R) theories and their scalar-tensor counterpart
• The Classical and Loop Quantum Cosmology Phase Space of Interacting Dark Energy and Superfluid Dark Matter
• Transit String Dark Energy Models in $f(Q)$ Gravity
• Dynamical systems of modified Gauss-Bonnet gravity: cosmological implications
• Scalar-tensor theory with Lagrange multipliers: a way of understanding the cosmological constant problem, and future singularities
• Reconstructing cosmic acceleration from modified and non-minimal gravity: The Yang-Mills case
• Stability of cosmological solutions in F(R) Horava-Lifshitz gravity
• Generalized Logarithmic Equation of State in Classical and Loop Quantum Cosmology Dark Energy-Dark Matter Coupled Systems
• Equivalent off-diagonal cosmological models and ekpyrotic scenarios in f(R)-modified, massive and Einstein gravity
• Complete density perturbations in the Jordan-Fierz-Brans-Dicke theory
• The cosmological constant filter without big bang singularity
• Dilaton Dark Energy Model in f(R), f(T) and Horava-Lifshitz Gravities
• On analytical solutions of f(R) modified gravity theories in FLRW cosmologies
• A Cosmological Holographic Reconstruction of f(Q) Theory
• A Matter with an effective EoS interacting with a tachynic field in an accelerating Universe
• Quintessence dark energy model in non-linear $f(Q)$ theory with bulk-viscosity
• Reconstructing cosmological solutions in F(R) gravity. Towards a unified model of the Universe evolution