Nonsingular electrovacuum solutions with dynamically generated cosmological constant

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• 作者：E.I. Guendelman ; Gonzalo J. Olmo ; D. Rubiera-Garcia ; M. Vasihoun
• 关键词：Modified gravity ; Palatini formalism ; Nonlinear electrodynamics ; Dynamical cosmological constant ; Nonsingular solutions ; Wormholes
• 刊名：Physics Letters B
• 出版年：4 November, 2013
• 年：2013
• 卷：726
• 期：4-5
• 页码：870-875
• 全文大小：243 K

文摘

We consider static spherically symmetric configurations in a Palatini extension of General Relativity including 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.