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Nonsingular electrovacuum solutions with dynamically generated cosmological constant

AutorGuendelman, E. I.; Olmo, Gonzalo J. ; Rubiera-García, D.; Vasihoun, M.
Palabras claveBlack-holes
Einsten equantions
Fecha de publicación4-nov-2013
EditorElsevier
CitaciónPhysics Letters - Section B 726 (4-5): 870-875 (2013)
ResumenWe 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.
Versión del editorhttp://dx.doi.org/10.1016/j.physletb.2013.09.039
URIhttp://hdl.handle.net/10261/126948
DOI10.1016/j.physletb.2013.09.039
ISSN0370-2693
E-ISSN1873-2445
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