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2009

On white dwarfs and neutron stars in Palatini f(R) gravity

Reijonen, Vappu

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In Palatini $f(R)$ gravity, the parameters of the Schwarzschild - de Sitter solution as well as the whole interior solutions of compact objects are expected to change when compared to general relativity.

We solve the Palatini field equations numerically in the case of the models $f(R) = R + \alpha R^2$ and $f(R) = R - \mu^4/R$, and using the equation of state of Fermi gas.
We show how the density profiles and the prediction for the maximum masses of white dwarfs (the Chandrasekhar limit) and neutron stars (the Tolman-Oppenheimer-Volkoff limit) are altered, and thereby conclude that observations on compact stars may be used to exclude alternative gravity models.

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