%0 Journal Article
%T Nonsingular electrovacuum solutions with dynamically generated cosmological constant
%A Guendelman, E. I.
%A Olmo, G. J.
%A Rubiera-Garcia, D.
%A Vasihoun, M.
%J Physics Letters B
%D 2013
%V 726
%N 4-5
%I Elsevier Science Bv
%@ 0370-2693
%G English
%F Guendelman_etal2013
%O WOS:000327907000045
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=1680), last updated on Thu, 23 Jan 2014 11:54:33 +0000
%X We consider static spherically symmetric configurations in a Palatini extension of General Relativity including R-2 and Ricci-squared terms, which is known to replace the central singularity by a wormhole in the electrovacuum case. We modify the matter sector of the theory by adding to the usual Maxwell term a nonlinear electromagnetic extension which is known to implement a confinement mechanism in flat space. One feature of the resulting theory is that the nonlinear electric field leads to a dynamically generated cosmological constant. We show that with this matter source the solutions of the model are asymptotically de Sitter and possess a wormhole topology. We discuss in some detail the conditions that guarantee the absence of singularities and of traversable wormholes.
%K Modified gravity
%K Palatini formalism
%K Nonlinear electrodynamics
%K Dynamical cosmological constant
%K Nonsingular solutions
%K Wormholes
%R 10.1016/j.physletb.2013.09.039
%U http://arxiv.org/abs/1306.6769
%U https://doi.org/10.1016/j.physletb.2013.09.039
%P 870-875