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Relativistic stars in f(R) gravity

E. Babichev 1 David Langlois 2
APC (UMR_7164) - AstroParticule et Cosmologie, Institut für theoretische Physik
Abstract : We study the strong gravity regime in viable models of so-called f(R) gravity that account for the observed cosmic acceleration. In contrast with recent works suggesting that very relativistic stars might not exist in these models, we find numerical solutions corresponding to static star configurations with a strong gravitational field. The choice of the equation of state for the star is crucial for the existence of solutions. Indeed, if the pressure exceeds three times the energy density in a large part of the star, static configurations do not exist. In our analysis, we use a polytropic equation of state, which is not plagued with this problem and, moreover, provides a better approximation for a realistic neutron star.
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Submitted on : Monday, April 20, 2009 - 5:00:29 PM
Last modification on : Sunday, November 29, 2020 - 5:32:02 PM

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E. Babichev, David Langlois. Relativistic stars in f(R) gravity. Physical Review D, American Physical Society, 2009, 80, pp.121501. ⟨10.1103/PhysRevD.80.121501⟩. ⟨in2p3-00377033⟩



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