Gauss-Bonnet source of Brans-Dicke scalar field and accelerated expansion of universe
Küçük Resim Yok
Tarih
2024
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
World Scientific Publ Co Pte Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this work, using a different theoretical approach, we study a homogeneous and isotropic cosmological spacetime filled with a perfect fluid. Using the framework of Brans-Dicke (BD) and Gauss-Bonnet (GB) theories and including a scalar potential, we obtain the analytical solution of the field equations and find the field functions and the relevant expansion parameter of the spacetime. We assume that the BD and GB media can interact with each other, and hence that there is an energy transfer between these two components. Using this approach, we assume that the BD scalar field is related to intrinsic properties of the GB medium. We introduced a power-law scalar field phi(t)=phi 0tp and found the appropriate dynamical functions for the different powers p. We found that the expansion rate of spacetime also behaves as a power-law, and the accelerating expansion is always satisfied for this model. We also analyze the stability for physically acceptable critical points for a given scale factor.
Açıklama
Anahtar Kelimeler
Brans-Dicke theory, Gauss-Bonnet theory, cosmology, scalar field theory
Kaynak
Modern Physics Letters A
WoS Q Değeri
N/A
Scopus Q Değeri
Q2
Cilt
39
Sayı
14
