http://arxiv.org/abs/1612.04177
We study the possible cosmological models in Kaluza-Klein-type multidimensional gravity with a curvature-nonlinear Lagrangian and a spherical extra space, taking into account the Casimir energy. First, we find a minimum of the effective potential of extra dimensions, leading to a physically reasonable value of the effective cosmological constant in our 4D space-time. In this model, the huge Casimir energy density is compensated by a fine-tuned contribution of the curvature-nonlinear terms in the original action. Second, we present a viable model with slowly evolving extra dimensions and power-law inflation in our space-time. In both models, the results formulated in Einstein and Jordan frames are compared.
S. Bolokhov and K. Bronnikov
Wed, 14 Dec 16
27/67
Comments: 6 pages, 1 figure, submitted to Proceedings of the International conference on particle physics and astrophysics (10-14 October 2016, Moscow, Russia)
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