TY  - JOUR
AU  - Guendelman, E. I.
AU  - Olmo, G. J.
AU  - Rubiera-Garcia, D.
AU  - Vasihoun, M.
PY  - 2013
DA  - 2013//
TI  - Nonsingular electrovacuum solutions with dynamically generated cosmological constant
T2  - Phys. Lett. B
JO  - Physics Letters B
SP  - 870
EP  - 875
VL  - 726
IS  - 4-5
PB  - Elsevier Science Bv
KW  - Modified gravity
KW  - Palatini formalism
KW  - Nonlinear electrodynamics
KW  - Dynamical cosmological constant
KW  - Nonsingular solutions
KW  - Wormholes
AB  - 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.
SN  - 0370-2693
UR  - http://arxiv.org/abs/1306.6769
UR  - https://doi.org/10.1016/j.physletb.2013.09.039
DO  - 10.1016/j.physletb.2013.09.039
LA  - English
N1  - WOS:000327907000045
ID  - Guendelman_etal2013
ER  -