Dark Energy and the Statistical Study of the Observed Image Separations of the Multiply Imaged Systems in the CLASS Statistical Sample

Abstract

The present day observations favour a universe which is flat, accelerated and composed of $\sim 1/3$ matter (baryonic + dark) and $\sim 2/3$ of a negative pressure component, usually referred to as dark energy or quintessence. The Cosmic Lens All Sky Survey (CLASS), the largest radio-selected galactic mass scale gravitational lens search project to date, has resulted in the largest sample suitable for statistical analyses. In the work presented here, we exploit observed image separations of the multiply imaged lensed radio sources in the sample. We use two different tests: (1) image separation distribution function $n(\Delta \theta )$ of the lensed radio sources and (2) ${\dtheta}_{\mathrm{pred}}$ vs ${\dtheta}_{\mathrm{obs}}$ as observational tools to constrain the cosmological parameters $w$ and $\Om$. The results are in concordance with the bounds imposed by other cosmological tests.

arXiv comment20 pages latex; Modified " Results and Discussion " section, new references added

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• Assessing the effect of lens mass model in cosmological application with updated galaxy-scale strong gravitational lensing sample
• Exact power series solutions of the structure equations of the general relativistic isotropic fluid stars with linear barotropic and polytropic equations of state
• Impact of Rastall gravity on mass, radius and sound speed of the pulsar PSR J0740+6620
• Probing the cosmic distance duality relation using time delay lenses
• A New Anisotropic Compact Star Model having Matese \& Whitman Mass Function
• Constraints on the Cardassian Expansion from the Cosmic Lens All-Sky Survey Gravitational Lens Statistics
• Anisotropic Star on Pseudo-Spheroidal Spacetime
• Cosmological Parameter Estimation Using Current and Future Observations of Strong Gravitational Lensing
• Observational constraints on the time-dependence of dark energy
• Killing vectors and anisotropy
• On the Stability of (M theory) Stars against Collapse : Role of Anisotropic Pressures