Hybrid f(R) theories, local constraints, and cosmic speedup

Abstract

We present an extension of general relativity in which an $f(R)$ term à la Palatini is added to the usual metric Einstein-Hilbert Lagrangian. Expressing the theory in a dynamically equivalent scalar-tensor form, we show that it can pass the Solar System observational tests even if the scalar field is very light or massless. Applications to cosmology and astrophysics, and some exact solutions are discussed.

3 pages, no figures, proceedings of 13th Marcel Grossmann Meeting

Cited by in corpus (7)

• Beyond Einstein's General Relativity: Hybrid metric-Palatini gravity and curvature-matter couplings
• Dynamic wormhole geometries in hybrid metric-Palatini gravity
• Constraints on Metric-Palatini Gravity from QPO Data
• Sudden singularities in generalized hybrid metric-Palatini cosmologies
• Weak-field regime of the generalized hybrid metric-Palatini gravity
• Cosmic strings in generalized hybrid metric-Palatini gravity
• Thermodynamics of Einstein-Geometric Proca AdS compact objects