1202.5699 (S. Capozziello et al.)

The physical foundations for the geometric structure of relativistic
theories of gravitation. From General Relativity to Extended Theories of
Gravity through Ehlers-Pirani-Schild approach    [PDF]

S. Capozziello, M. De Laurentis, L. Fatibene, M. Francaviglia

We discuss in a critical way the physical foundations of geometric structure of relativistic theories of gravity by the so-called Ehlers-Pirani-Schild formalism. This approach provides a natural interpretation of the observables showing how relate them to General Relativity and to a large class of Extended Theories of Gravity. In particular we show that, in such a formalism, geodesic and causal structures of space-time can be safely disentangled allowing a correct analysis in view of observations and experiment. As specific case, we take into account the case of f(R) gravity.

View original: http://arxiv.org/abs/1202.5699