作者: Anupam Mazumdar , Tirthabir Biswas , Tomi Koivisto
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摘要: It was recently found that there are classes of nonlocal gravity theories free ghosts and singularities in their Newtonian limit [PRL, 108 (2012), 031101]. In these proceedings, a detailed pedagogical derivation main result, the flat space propagator for an arbitrary covariant metric theory gravitation, is presented. The result applied to analyse f(R) models, Gauss-Bonnet theory, Weyl-squared potentially asymptotically theories.