On stable exponential cosmological solutions in the EGB model with a cosmological constant in dimensions D = 5, 6, 7, 8


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Abstract

A D-dimensional Einstein–Gauss–Bonnet (EGB) flat cosmological model with a cosmological constant Λ is considered. We focus on solutions with an exponential time dependence of the scale factor. Using the previously developed general stability analysis of such solutions by V.D. Ivashchuk (2016), we apply the criterion from that paper to all known exponential solutions up to the dimension 7 + 1. We show that this criterion, which guarantees the stability of solutions under consideration, is fulfilled for all combinations of the coupling constant of the theory except for some discrete set.

About the authors

D. M. Chirkov

Bauman Moscow State Technical University

Author for correspondence.
Email: chirkovdm@live.com
Russian Federation, 2-ya Baumanskaya ul. 5, Moscow, 105005

A. V. Toporensky

Sternberg Astronomical Institute; Kazan Federal University

Email: chirkovdm@live.com
Russian Federation, Universitetsky Prospekt 13, Moscow, 119991; Kremlevskaya 18, Kazan, 420008

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