Abstract
We study the properties of an effective potential for the scale factor of extra dimensions in a Kaluza-Klein-type model with a spherical extra factor space, including a function of the scalar curvature and other quadratic curvature invariants, taking into account the Casimir energy of massless scalar fields. We demonstrate the existence of a minimum of the potential, able to induce a physically reasonable value of the effective cosmological constant in our space-time. Under the adopted assumptions, it is shown that the huge Casimir energy density can be compensated by the fine-tuned contribution of the curvature-nonlinear terms in the original action.
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Bolokhov, S.V., Bronnikov, K.A. On nonlinear multidimensional gravity and the Casimir effect. Gravit. Cosmol. 22, 323–328 (2016). https://doi.org/10.1134/S0202289316040034
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DOI: https://doi.org/10.1134/S0202289316040034