Observational Constraints of New Variable Modified Chaplygin Gas Model

2012/11/09 by Jhumpa Bhadra, Bhadra, Jhumpa, Ujjal Debnath +1 · 2 citations
Physics and Astronomy · #FOS: Physical sciences #General Physics (physics.gen-ph) #physics.gen-ph

paper · pdf · doi:10.48550/arxiv.1211.2783

9 pages, 7 figures. arXiv admin note: substantial text overlap with arXiv:1206.0507

arxiv created 2012/11/09 · arxiv updated 2012/11/13

Abstract

Assuming the flat FRW universe in Einstein's gravity filled with New Variable Modified Chaplygin gas (NVMCG) dark energy and dark matter having negligible pressure. In this research work we analyze the viability on the basis of recent observation. Hubble parameter H is expressed in terms of the observable parameters H₀, Ω_m⁰ and the model parameters A₀, B₀, C₀, m, n, α and the red shift parameter z. Here we find a best fitted parameter range of A₀, B₀ keeping 0≤ α≤ 1 and using Stern data set (12 points) by minimizing the χ² test at 66%, 90% and 99% confidence levels. Next we do the joint analysis with BAO and CMB observations. Again evaluating the distance modulus μ(z) vs redshift (z) curve obtained in the model NVMCG with dark matter with the best fitted value of the parameters and comparing with that derived from the union2 compilation data.

Cited by

• Observational Constraints of Modified Chaplygin Gas in RS II Brane
• Observational data fitting to constrain Variable Modified Chaplygin Gas in the background of Horava-Lifshitz Gravity

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