The cosmic snap parameter in f(R) gravity

Abstract

We derive the expression for the snap parameter in f(R) gravity. We use the Palatini variational principle to obtain the field equations and regard the Einstein conformal frame as physical. We predict the present-day value of the snap parameter for the particular case f(R)=R-const/R, which is the simplest f(R) model explaining the current acceleration of the universe.

9 pages; published version

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• Conditions for the cosmological viability of f(R) dark energy models
• Limit to General Relativity in f(R) theories of gravity
• Matter instability in modified gravity
• Solar System tests DO rule out 1/R gravity
• de Sitter space and the equivalence between f(R) and scalar-tensor gravity
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• The future evolution and finite-time singularities in $F(R)$-gravity unifying the inflation and cosmic acceleration
• Cosmography of f(R) gravity
• Initial and final de Sitter universes from modified $f(R)$ gravity
• The Cosmology of Ricci-Tensor-Squared Gravity in the Palatini Variational Approach
• Power-law cosmic expansion in f(R) gravity models
• Can f(R) Modified Gravity Theories Mimic a LCDM Cosmology?
• On the co-existence of matter dominated and accelerating solutions in f(G)-gravity
• Delicate f(R) gravity models with disappearing cosmological constant and observational constraints on the model parameters
• Dynamics of f(R)-cosmologies containing Einstein static models
• Dynamical systems analysis of anisotropic cosmologies in $R^n$-gravity
• Black hole entropy in modified gravity models
• Microscopic and Macroscopic Behaviors of Palatini Modified Gravity Theories
• Consistency of $f(R)=\sqrt{R^2-R_0^2}$ Gravity with the Cosmological Observations in Palatini Formalism
• Compactifying the state space for alternative theories of gravity