Violation of causality in f(R) gravity

Abstract

We examine the question as to whether the f(R) gravity theories, in both metric and in Palatini formalisms, permit space-times in which the causality is violated. We show that the field equations of these f(R) gravity theories admit solutions with violation of causality for a physically well-motivated perfect-fluid matter content.

arXiv comment3 pages. To appear in the Proc. of 12th Marcel Grossmann Meeting on General Relativity, Paris, 12--18 July 2009