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Physical Review D 77 (2008) 124024
"Detuned" f(R) gravity and dark energy
N. Deruelle1, 2, M. Sasaki3, Y. Sendouda3

In gravity theories derived from a f(R) Lagrangian, matter is usually supposed to be minimally coupled to the metric, which hence defines a ''Jordan frame.'' However, since the field equations are fourth order, gravity possesses an extra degree of freedom on top of the standard graviton, as is manifest from its equivalent description in the conformally related, Einstein, frame. We introduce explicitly this extra scalar degree of freedom in the action and couple it to matter, so that the original metric no longer defines a Jordan frame. This ''detuning'' puts f(R) gravity into a wider class of scalar--tensor theories. We argue that a ''chameleon-like'' detuning tracing the background matter density may provide purely gravitational models which account for the present acceleration of the universe and evade local gravity constraints.
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
2 :  Racah Institute of Physics
3 :  Yukawa Institute for Theoretical Physics
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique

Physique/Relativité Générale et Cosmologie Quantique

Physique/Physique des Hautes Energies - Théorie
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