Cosmological constant dominated transit universe from early deceleration to current acceleration phase in Bianchi-V space-time

Abstract

The paper presents the transition of universe from early decelerating phase to current accelerating phase with viscous fluid and time dependent cosmological constant $(\Lambda )$ as source of matter in Bianchi-V space-time. To study the transit behaviour of universe, we have assumed the scale factor as increasing function of time which generates a time dependent deceleration parameter (DP). The study reveals that the cosmological term does not change its fundamental nature for $\xi$ = constant and $\xi =\xi (t)$, where $\xi$ is the coefficient of bulk viscosity. The $\Lambda (t)$ is found to be positive and is decreasing function of time. The same is observed by recent supernovae observations. The physical behaviour of universe has been discussed in detail.

arXiv comment7 pages, 3 figures

References in corpus (23)

• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Type Ia Supernova Discoveries at z>1 From the Hubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution
• 4D Gravity on a Brane in 5D Minkowski Space
• A Phantom Menace? Cosmological consequences of a dark energy component with super-negative equation of state
• Cosmological Constant - the Weight of the Vacuum
• An alternative to quintessence
• Discovery of a Supernova Explosion at Half the Age of the Universe and its Cosmological Implications
• The Supernova Legacy Survey: Measurement of Omega_M, Omega_Lambda and w from the First Year Data Set
• A Dynamical Solution to the Problem of a Small Cosmological Constant and Late-time Cosmic Acceleration
• Measurements of the Cosmological Parameters Omega and Lambda from the First 7 Supernovae at z >= 0.35
• Accelerated expansion of the universe driven by tachyonic matter
• Acceleration at z>1?
• Estimating the Redshift Distribution of Photometric Galaxy Samples II. Applications and Tests of a New Method
• Dark energy models with variable equation of state parameter
• Anisotropic cosmological models with a perfect fluid and a $\Lambda$ term
• Some Anisotropic Dark Energy Models in Bianchi Type-V Space-time
• Some Bianchi Type-V Models of Accelerating Universe with Dark Energy
• Accelerating dark energy models in bianchi Type-V space-time
• Is the present expansion of the universe really accelerating?
• Bulk Viscous LRS Biachi-I Universe with variable $G$ and decaying $\Lambda$
• Generation of Bianchi type V cosmological models with varying $\Lambda$-term
• Tilted Bianchi Type V Bulk Viscous Cosmological Models in General Relativity
• Dissipative Future Universe without Big Rip

Cited by in corpus (6)

• Viability of Bianchi type V Universe in $f(R,T)=f_1(R)+f_2(R)f_3(T)$ gravity
• A transitioning universe with anisotropic dark energy
• Two Fluid Scenario in Bianchi Type-I Universe
• Accelerating Bianchi Type-V Cosmology with Perfect Fluid and Heat Flow in Saez-Ballester Theory
• Bianchi type-I transit cosmological models with time dependent gravitational and cosmological constants - reexamined
• Transit universe with time varying $G$ and decaying $\Lambda$