Structure of compact stars in Palatini f (R) gravity

GARCÍA, F.; TEPPA PANNIA, FLORENCIA A.; PEREZ BERGLIAFFA, S. E.; ORELLANA, M.; ROMERO, GUSTAVO E

Congreso; Second Argentinian-Brazilian Meeting GRACO 2; 2014

The study of the structure of compact objects in modified theoriesof gravity can be useful to constrain f (R)-theories in the strong gravitationalregime. In particular, the structure of compact stars in the theory with Langrangiandensity f (R) = R + R2 have been recently explored using the metricformalism.In this work we analyze configurations of neutron stars in squared-gravityusing the Palatini formalism, in which the field equations are of second order,and the modified Tolman-Oppenheimer-Volkoff equations for a sphericallysymmetricand static metric can be derived without approximation, as in GeneralRelativity.The numerical integration of the structure equations allows us to study themass-radius configurations and the characteristics of internal profiles.We compare our results with those obtained using General Relativity.