Generalized Model for $\Lambda$-Dark Energy

Abstract

Einstein field equations under spherically symmetric space-times are considered here in connection to dark energy investigation. A set of solutions are obtained for a kinematical $\Lambda$ model, viz., $\Lambda \sim (\dot{a}/a{)}^2$ without assuming any {\it a priori} value for the curvature constant and the equation of state parameter $\omega$. Some interesting results, such as the nature of cosmic density $\Omega$ and deceleration parameter $q$, have been obtained with the consideration of two-fluid structure instead of usual uni-fluid cosmological model.

8 Latex pages

References in corpus (18)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Type Ia Supernova Discoveries at z>1 From the Hubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution
• Cosmological parameters from SDSS and WMAP
• A Phantom Menace? Cosmological consequences of a dark energy component with super-negative equation of state
• The Case for a Positive Cosmological Lambda-term
• The Supernova Legacy Survey: Measurement of Omega_M, Omega_Lambda and w from the First Year Data Set
• Phantom Energy and Cosmic Doomsday
• New Constraints on ${\Omega }_M$, ${\Omega }_{\Lambda }$, and w from an Independent Set of Eleven High-Redshift Supernovae Observed with HST
• Consistent modified gravity: dark energy, acceleration and the absence of cosmic doomsday
• A theoretician's analysis of the supernova data and the limitations in determining the nature of dark energy
• You need not be afraid of phantom energy
• Acceleration at z>1?
• Phantom appearance of non-phantom matter
• On the estimation of the current value of the cosmological constant
• Cosmological models with Gurzadyan-Xue dark energy

Cited by in corpus (6)

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• Variable Equation of State for Generalized Dark Energy Model
• Cosmological model with linear equation of state parameter in f(R, Lm) gravity
• Generalized phenomenological models of dark energy
• Accelerating Universe from Modified Kasner Model in Extra Dimensions
• Modified Power law Inflation: solution to the graceful exit problem and improvement of dark energy models