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Physical Review D 80 (2009) 121501
Relativistic stars in f(R) gravity
E. Babichev1, D. Langlois1, 2
(2009)

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.
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
2 :  IAP - Institut d'Astrophysique de Paris
APC - THEORIE
Physique/Relativité Générale et Cosmologie Quantique

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique
General Relativity and Quantum Cosmology – Astrophysics – Cosmology and Extragalactic Astrophysics
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/0904.1382