Conformal aspects of Palatini approach in Extended Theories of Gravity

Details Conformal aspects of Palatini approach in Extended Theories of Gravity Conformal aspects of Palatini approach in Extended Theories of Gravity

2004-09-20

arxiv.org/abs/hep-th/0409198v1

Gen.Rel.Grav.38:33-60,2006

Physics

High Energy Physics

High Energy Physics - Theory

Scientific paper

10.1007/s10714-005-0208-7

The debate on the physical relevance of conformal transformations can be faced by taking the Palatini approach into account to gravitational theories. We show that conformal transformations are not only a mathematical tool to disentangle gravitational and matter degrees of freedom (passing from the Jordan frame to the Einstein frame) but they acquire a physical meaning considering the bi-metric structure of Palatini approach which allows to distinguish between spacetime structure and geodesic structure. Examples of higher-order and non-minimally coupled theories are worked out and relevant cosmological solutions in Einstein frame and Jordan frames are discussed showing that also the interpretation of cosmological observations can drastically change depending on the adopted frame.

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