The post-Newtonian limit in C-theories of gravitation

Abstract

C-theory provides a unified framework to study metric, metric-affine and more general theories of gravity. In the vacuum weak-field limit of these theories, the parameterized post-Newtonian (PPN) parameters $\beta$ and $\gamma$ can differ from their general relativistic values. However, there are several classes of models featuring long-distance modifications of gravity but nevertheless passing the Solar system tests. Here it is shown how to compute the PPN parameters in C-theories and also in nonminimally coupled curvature theories, correcting previous results in the literature for the latter.

5 pages, no figures; To appear in PRD as a rapid communication

References in corpus (7)

• Palatini Approach to Modified Gravity: f(R) Theories and Beyond
• Constraining f(R) Gravity as a Scalar Tensor Theory
• Solar System constraints to general f(R) gravity
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• Generalised Quadratic Curvature, Non-Local Infrared Modifications of Gravity and Newtonian Potentials
• Post-Newtonian parameters gamma and beta of scalar-tensor gravity with a general potential
• The bimetric variational principle for General Relativity
• On the consistency of non-minimally coupled f(R) gravity
• Post-Newtonian parameter $\gamma$ for multiscalar-tensor gravity with a general potential
• Variational approach to gravitational theories with two independent connections
• Hybrid metric-Palatini brane system
• Binary systems in Palatini-f(R) gravity
• Novel aspects of C-theories in Cosmology
• Effectively nonlocal metric-affine gravity