On stable exponential cosmological solutions with non-static volume factor in the Einstein-Gauss-Bonnet model

International Conference on Particle Physics and Astrophysics

物理学;天文学

Ivashchuk, V.D.^1,2 ; Ernazarov, K.K.^2

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

119361, Russia^1

Institute of Gravitation and Cosmology, Peoples' Friendship University of Russia, Miklukho-Maklaya St. 6, Moscow

117198, Russia^2

关键词: Cosmological constants;    Exponential dependence;    Exponential solutions;    Gravitational constant;    Gravitational model;    Scale Factor;    Stability analysis;    Zero variation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/798/1/012089/pdf
DOI  :  10.1088/1742-6596/798/1/012089

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

A (n + 1)-dimensional gravitational model with cosmological constant and Gauss-Bonnet term is studied. The ansatz with diagonal cosmological metrics is adopted and solutions with exponential dependence of scale factors: ai∼ exp (vit), i = 1, ..., n, are considered. The stability analysis of the solutions with non-static volume factor is presented. We show that the solutions with v1= v2= v3= H > 0 and small enough variation of the effective gravitational constant G are stable if certain restriction on (vi) is obeyed. New examples of stable exponential solutions with zero variation of G in dimensions D = 1 + m + 2 with m > 2 are presented.