Cosmology in nonlinear multidimensional gravity and the Casimir effect

International Conference on Particle Physics and Astrophysics

物理学;天文学

Bolokhov, S.V.^1 ; Bronnikov, K.A.^1,2,3

Peoples' Friendship University of Russia, RUDN University, 6 Miklukho-Maklaya St., Moscow

117198, Russia^1

Center for Gravitation and Fundamental Metrology, VNIIMS, 46 Ozyornaya St., Moscow

119361, Russia^2

National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Kashirskoe highway 31, Moscow

115409, Russia^3

关键词: Casimir effects;    Cosmological constants;    Cosmological models;    Effective potentials;    Extra dimensions;    Nonlinear Lagrangian;    Nonlinear terms;    Reasonable value;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/798/1/012091/pdf
DOI  :  10.1088/1742-6596/798/1/012091

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

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.