相对论引力理论几何结构的物理基础。从广义相对论到广义引力理论的Ehlers-Pirani-Schild方法
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
摘要：
本文用所谓的Ehlers-Pirani-Schild形式主义批判地讨论了相对论引力理论几何结构的物理基础。这种方法提供了一个自然的解释，显示如何将它们与广义相对论和一个大类的引力扩展理论。特别是，我们表明，在这样的形式主义，测地线和因果结构的时空可以安全地解开允许正确的分析，鉴于观察和实验。作为特殊情况，我们考虑f（R）引力的情况。
英文摘要：
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.
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