Regular Article – Theoretical Physics
Inhomogeneous compact extra dimensions and de Sitter cosmology
VNIIMS, Ozyornaya ul. 46, 119361, Moscow, Russia
2 Institute of Gravitation and Cosmology, RUDN University, ul. Miklukho-Maklaya 6, 117198, Moscow, Russia
3 National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe shosse 31, 115409, Moscow, Russia
4 N. I. Lobachevsky Institute of Mathematics and Mechanics, Kazan Federal University, Kremlevskaya Street 18, 420008, Kazan, Russia
Accepted: 12 October 2020
Published online: 20 October 2020
In the framework of multidimensional f(R) gravity, we study the possible metrics of compact extra dimensions assuming that our 4D space has the de Sitter metric. Manifolds described by such metrics could be formed at the inflationary and even higher energy scales. It is shown that in the presence of a scalar field, it is possible to obtain a variety of inhomogeneous metrics in the extra factor space . Each of these metrics leads to a certain value of the 4D cosmological constant , and in particular, it is possible to obtain , as is confirmed by numerically obtained solutions. A nontrivial scalar field distribution in the extra dimensions is an important feature of this family of metrics. The obtained solutions are shown to be stable under extra-dimensional perturbations.
© The Author(s) 2020
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