Strange stars in $f(R)$ theories of gravity in the Palatini formalism

Abstract

In the present work we study strange stars in $f(R)$ theories of gravity in the Palatini formalism. We consider two concrete well-known cases, namely the $R+R^2/(6M^2)$ model as well as the $R-{\mu }^4/R$ model for two different values of the mass parameter $M$ or $\mu$. We integrate the modified Tolman-Oppenheimer-Volkoff equations numerically, and we show the mass-radius diagram for each model separately. The standard case corresponding to the General Relativity is also shown in the same figure for comparison. Our numerical results show that the interior solution can be vastly different depending on the model and/or the value of the parameter of each model. In addition, our findings imply that i) for the cosmologically interesting values of the mass scales $M,\mu$ the effect of modified gravity on strange stars is negligible, while ii) for the values predicting an observable effect, the modified gravity models discussed here would be ruled out by their cosmological effects.

10 pages, 2 figures

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• Early evolutionary tracks of low-mass stellar objects in modified gravity
• Strange stars in $f(\mathcal{R})$ gravity Palatini formalism and gravitational wave echoes from them
• White dwarf stars in modified gravity
• Dark stars in Starobinsky's model
• The Palatini star: exact solutions of the modified Lane-Emden equation
• Regular Black Hole Models in the Transition from Baryonic Matter to Quark Matter