%0 Journal Article
%T Nonsingular black holes in quadratic Palatini gravity
%A Olmo, G. J.
%A Rubiera-Garcia, D.
%J European Physical Journal C
%D 2012
%V 72
%N 8
%I Springer
%@ 1434-6044
%G English
%F Olmo+Rubiera-Garcia2012
%O WOS:000308239900030
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=1138), last updated on Thu, 27 Sep 2012 11:06:14 +0000
%X We find that if general relativity is modified at the Planck scale by a Ricci-squared term, electrically charged black holes may be nonsingular. These objects concentrate their mass in a microscopic sphere of radius r(core) approximate to N(q)(1/2)l(P)/3, where l(P) is the Planck length and N-q is the number of electric charges. The singularity is avoided if the mass of the object satisfies the condition M-0(2) approximate to m(P)(2)alpha N-3/2(em)q(3)/2, where m(P) is the Planck mass and alpha(em) is the fine-structure constant. For astrophysical black holes this amount of charge is so small that their external horizon almost coincides with their Schwarzschild radius. We work within a first-order (Palatini) approach.
%R 10.1140/epjc/s10052-012-2098-7
%U http://arxiv.org/abs/1112.0475
%U https://doi.org/10.1140/epjc/s10052-012-2098-7
%P 2098-5pp