Dark energy cosmological models with general forms of scale factor

Abstract

In this paper, we have constructed dark energy models in an anisotropic Bianchi-V space-time and studied the role of anisotropy in the evolution of dark energy. We have considered anisotropic dark energy fluid with different pressure gradients along different spatial directions. In order to obtain a deterministic solution, we have considered three general forms of scale factor. The different forms of scale factors considered here produce time varying deceleration parameters in all the cases that simulates the cosmic transition. The variable equation of state (EoS) parameter, skewness parameters for all the models are obtained and analyzed. The physical properties of the models are also discussed.

Modeling of Accelerating Universe with Bulk Viscous Fluid in Bianchi V Space‐Time

“…Several such scale factors have been investigated to mimic this transitive behavior. [ 9,10 ] Farnes [ 11 ] has suggested a toy model that leads to a cyclic Universe with a time variable Hubble parameter. The model provides compatibility with the current tension, which has been emerged in the cosmological measurements.…”

Gravitational Baryogenesis of Cosmological Constant Dominated Universe

“…Several theoretical models based on DE, showing acceleration expansion of the universe, have been proposed in the last two decades [5][6][7][8][9][10][11][12][13][14][15]. In particular, Akarsu et al [13] have considered the simplest anisotropic generalization, as a correction, to the cosmological constant-cold dark matter (ΛCDM) model by replacing the spatially flat Robertson-Walker metric with the Bianchi type-I metric, which brings in a new anisotropic density in the average expansion rate H(a) of the Universe.…”

Bianchi Type- I Bulk Viscosity with a DE Cosmological Model

“…Santhi et al [52] have studied bulk viscous string cosmological models in f ðRÞ gravity. Two fluids of DE cosmological models were constructed in different general scale factors (Mishra et al [53]). So, all above information gives us motivation to investigate Bianchi type-I spacetime bulk viscous fluid with dark energy cosmological model using hybrid scale factor.…”