2020/09/21 by В. Д. Иващук, Ivashchuk, V. D., A. A. Kobtsev +1
Earth and Planetary Sciences · Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Geophysics and Gravity Measurements #High Energy Physics - Theory (hep-th)
paper · pdf · doi:10.48550/arxiv.2009.10204
openalex publication_date 2020/09/21 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
A (m+ 3)-dimensional Einstein-Gauss-Bonnet gravitational model including the Gauss-Bonnet term and the cosmological term Λ is considered. Exact solutions with exponential time dependence of two scale factors, governed by two Hubble-like parameters H >0 and h ≠ H, corresponding to factor spaces of dimensions m >2 and l = 2, respectively, are found. Under certain restrictions on x = h/H , the stability of the solutions in a class of cosmological solutions with diagonal metrics is proved. A subclass of solutions with small enough variation of the effective gravitational constant G is considered and the stability of all solutions from this subclass is shown.