Generalized dark gravity

Abstract

The late-time cosmic acceleration may be due to infra-red modifications of General Relativity. In particular, we consider a maximal extension of the Hilbert-Einstein action and analyze several interesting features of the theory. Generally, the motion is non-geodesic and takes place in the presence of an extra force, which is orthogonal to the four-velocity. These models could lead to some major differences, as compared to the predictions of General Relativity or other modified theories of gravity, in several problems of current interest, such as cosmology, gravitational collapse or the generation of gravitational waves. The study of these phenomena may also provide some specific signatures and effects, which could distinguish and discriminate between the various gravitational models.

8 pages. Received an Honorable Mention in the Gravity Research Foundation Essay Contest 2012

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Cited by in corpus (14)

• Generalized curvature-matter couplings in modified gravity
• Generalized energy conditions in Extended Theories of Gravity
• Future singularities and Teleparallelism in Loop Quantum Cosmology
• Conservation laws in theories with universal gravity/matter coupling
• Beyond Einstein's General Relativity: Hybrid metric-Palatini gravity and curvature-matter couplings
• Dark matter as a Weyl geometric effect
• Palatini formulation of the conformally invariant $f\left(R,L_m\right)$ gravity theory
• Coupling matter and curvature in Weyl geometry: conformally invariant $f\left(R,L_m\right)$ gravity
• Extended Theories of Gravity with Generalized Energy Conditions
• Generation of large-scale magnetic fields from inflation in teleparallelism
• Dynamical reconstruction of the $\Lambda$CDM model in scalar-tensor $f(R,T)$ gravity
• Irreversible Geometrothermodynamics of Open Systems in Modified Gravity
• Stellar structure of quark stars in a modified Starobinsky gravity
• Self-similar cosmological solutions in f(R,T) gravity theory