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Hybrid Modified Gravity Unifying Local Tests, Galactic Dynamics and Late-time Cosmic Acceleration by Capozziello, Salvatore; Harko, Tiberiu; Lobo, Francisco S. N.; Olmo, Gonzalo J. is a scholarly article available to read on EtoBox.

What is Hybrid Modified Gravity Unifying Local Tests, Galactic Dynamics and Late-time Cosmic Acceleration about?

The non-equivalence between the metric and Palatini formalisms of $f(R)$ gravity is an intriguing feature of these theories. However, in the recently proposed hybrid metric-Palatini gravity, consisting of the superposition of the metric Einstein-Hilbert Lagrangian with an $f(\cal R)$ term constructed \`{a} la Palatini, the "true" gravitational field is described by the interpolation of these two non-equivalent approaches. The theory predicts the existence of a light long-range scalar field, which passes the local constraints and affects the galactic and cosmological dynamics. Thus, the theory opens new possibilities for a unified approach, in the same theoretical framework, to the problems of dark energy and dark matter, without distinguishing a priori matter and geometric sources, but taking their dynamics into account under the same standard.

Author

Capozziello, Salvatore; Harko, Tiberiu; Lobo, Francisco S. N.; Olmo, Gonzalo J.

Published

2013

Language

EN