Exploring Bianchi Type-VI0 Viscous Holographic Ricci Dark Energy Cosmological Model in Brans-Dicke Theory of Gravitation
Abstract
We investigate a viscous holographic Ricci dark energy (VHRDE) model in Bianchi type (BT) -
VIo spacetime within Brans–Dicke (BD) gravity, incorporating a pressure-less matter component. Assuming
a relationship between metric potentials and a parameterised bulk viscosity coefficient, exact solutions of
the BD field equations are found. The combined effects of anisotropy, Ricci holographic cutoff, and bulk
viscosity yield a dynamical framework that can describe multiple phases of cosmic evolution. We examine the
progression of significant measurements, including the scalar field, energy densities, bulk viscosity, viscous
pressure, equation of state (EoS), expansion variables, and the deceleration parameter, revealing a transition
from a decelerated, matter-dominated epoch to an accelerated, dark-energy-dominated phase. Bulk viscosity
generates effective negative pressure driving acceleration, while the BD scalar field modulates gravitational
coupling. Comparison with previous studies confirms that this model provides a viable mechanism for cosmic
acceleration without requiring a cosmological constant.
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References
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