Cosmology with Hu-Sawicki gravity in Palatini Formalism

Abstract

Cosmological models based on f(R)-gravity may exhibit a natural acceleration mechanism without introducing a dark energy component. In this paper, we investigate cosmological consequences of the so-called Hu-Sawicki f(R)-gravity in the Palatini formalism. We derive theoretical constraints on the model parameters and perform a statistical analysis to determine the parametric space allowed by current observational data. We find that this class of models is indistinguishable from the standard ΛCDM model at the background level. Differently, from previous results in the metric approach, we show that these scenarios are able to produce the sequence of radiation-dominated, matter-dominated, and accelerating periods without need of dark energy.

7 pages, 3 figures, LaTeX. arXiv admin note: substantial text overlap with arXiv:1012.3943

References in corpus (39)

• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
• Dark torsion as the cosmic speed-up
• Cosmological viability of f(R)-gravity as an ideal fluid and its compatibility with a matter dominated phase
• Palatini Approach to Modified Gravity: f(R) Theories and Beyond
• f(R,L_m) gravity
• Are f(R) dark energy models cosmologically viable ?
• Horava-Lifshitz Cosmology: A Review
• Energy conditions in f(R)-gravity
• Cosmography of f(R) gravity
• Cluster Constraints on f(R) Gravity
• Non-linear evolution of f(R) cosmologies II: power spectrum
• The matter power spectrum in f(R) gravity
• f(R) gravity theories in Palatini formalism: cosmological dynamics and observational constraints
• The matter Lagrangian and the energy-momentum tensor in modified gravity with non-minimal coupling between matter and geometry
• A no-go theorem for polytropic spheres in Palatini f(R) gravity
• Palatini formulation of modified gravity with a nonminimal curvature-matter coupling
• Spherically symmetric spacetimes in f(R) gravity theories
• Initial and final de Sitter universes from modified $f(R)$ gravity
• Hamiltonian Formulation of Palatini f(R) theories a la Brans-Dicke
• Constraints on f(R) Cosmology in the Palatini Formalism
• CMB and Matter Power Spectra of Early f(R) Cosmology in Palatini Formalism
• Gravitational Perfect Fluid Collapse in f(R) Gravity
• Curvature singularities, tidal forces and the viability of Palatini f(R) gravity
• Re-examination of Polytropic Spheres in Palatini f(R) Gravity
• Extension of loop quantum gravity to $f(R)$ theories
• The Cauchy problem for metric-affine f(R)-gravity in presence of perfect-fluid matter
• The Cauchy problem of f(R) gravity
• Anisotropic Fluid and Bianchi Type III Model in f(R) Gravity
• Energy conditions in f(R) gravity and Brans-Dicke theories
• Gödel-type universes in f(R) gravity
• Accelerated Cosmological Models in Modified Gravity tested by distant Supernovae SNIa data
• Cosmological Constraints from Hubble Parameter on f(R) Cosmologies
• Consistency of $f(R)=\sqrt{R^2-R_0^2}$ Gravity with the Cosmological Observations in Palatini Formalism
• $f(R)$ gravity theories in the Palatini Formalism constrained from strong lensing
• Gödel-type universes in Palatini f(R) gravity
• Cosmological constraints on the Hu-Sawicki modified gravity scenario
• A comment on "The Cauchy problem of f(R)- gravity", Class. Quantum Grav., 24, 5667 (2007), arXiv:0709.4414
• Dynamics and Constraints of the Massive Gravitons Dark Matter Flat Cosmologies