130 citations · 598 across the 8 of their papers we have counts for
8 papers
The viability of theories with matter coupled to the Ricci scalar
Thomas P. Sotiriou
Recently there has been a proposal for modified gravitational f(R) actions which include a direct coupling between the matter action and the Ricci scalar, R. Of particular interest…
Perturbed Kerr Black Holes can probe deviations from General Relativity
Enrico Barausse, Thomas P. Sotiriou
Although the Kerr solution is common to many gravity theories, its perturbations are different in different theories. Hence, perturbed Kerr black holes can probe deviations from Ge…
Curvature singularities, tidal forces and the viability of Palatini f(R) gravity
E. Barausse, T. P. Sotiriou, J. C. Miller
In a previous paper we showed that static spherically symmetric objects which, in the vicinity of their surface, are well-described by a polytropic equation of state with 3/2<Gamma…
Theory of gravitation theories: a no-progress report
Thomas P Sotiriou, Valerio Faraoni, Stefano Liberati
Already in the 1970s there where attempts to present a set of ground rules, sometimes referred to as a theory of gravitation theories, which theories of gravity should satisfy in o…
Reply to "Can gravitational dynamics be obtained by diffeomorphism invariance of action?"
Thomas P. Sotiriou, Stefano Liberati
In a previous work we showed that, in a suitable setting, one can use diffeomorphism invariance in order to derive gravitational field equations from boundary terms of the gravitat…
A no-go theorem for polytropic spheres in Palatini f(R) gravity
Enrico Barausse, Thomas P. Sotiriou, John C. Miller
Non-vacuum static spherically-symmetric solutions in Palatini f(R) gravity are examined. It is shown that for generic choices of f(R), there are commonly-used equations of state fo…