Anisotropic new agegraphic dark energy model with sign-changeable interaction in a scalar-tensor theory

This work examines the dark energy phenomenon by studying the New Agegraphic Dark Energy (NADE) and Dark Matter (DM) within the framework of Brans-Dicke (BD) scalar tensor theory of gravitation. To achieve a solution, we consider the viable deceleration parameter, which contributes to the average scale factor a = e(1/gamma root 2 gamma t+c1), where gamma, and c(1) are, respectively, arbitrary and integration constants. We have derived the field equations of BD scalar tensor theory of gravity with the help of axially symmetric Universe. We have constructed two cases of non-interacting and sign-changeable interacting components scenario. We have investigated cosmological parameters, namely Deceleration Parameter(DP)(q), energy densities (rho(M)) and (rho(a)) of DM and NADE, Brans-Dicke scalar field (phi), skewness parameter (alpha), and equation of state parameter (omega(a)). The physical debate of these cosmological parameters is investigated through graphical presentation. Moreover, the stability of the models is explained through Squared Sound Speed (SSS) (c(s)(2)) and the well-known cosmological planes {r -s}, {r - q}, and omega(a) - omega(a)' are constructed and analyzed through graphical representation for our models.

Automated summary

This study examines the dark energy phenomenon by studying the New Agegraphic Dark Energy (NADE) and Dark Matter (DM) within the framework of Brans-Dicke scalar tensor theory of gravitation. The viable deceleration parameter and cosmological parameters are considered to investigate the physical debate and stability of the models. Graphical presentations are used for analysis.