PT Journal
AU Capozziello, S
   Harko, T
   Lobo, FSN
   Olmo, GJ
TI Hybrid Modified Gravity Unifying Local Tests, Galactic Dynamics and Late-Time Cosmic Acceleration
SO International Journal of Modern Physics D
JI Int. J. Mod. Phys. D
PY 2013
BP 1342006
EP 7pp
VL 22
IS 12
DI 10.1142/S0218271813420066
LA English
DE Modified gravity; late-time cosmic acceleration; dark matter; solar system tests
AB The nonequivalence 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(R) term constructed a la Palatini, the "true" gravitational field is described by the interpolation of these two nonequivalent 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.
ER