2010/11/26 by Hassan Amirhashchi · 28 citations
Physics and Astronomy · #Acceleration #Astrophysics #Black Holes and Theoretical Physics #CMB cold spot #Classical mechanics #Cosmic microwave background #Cosmological constant #Cosmology #Cosmology and Gravitation Theories #Dark energy #Deceleration parameter #Energy density #Galaxies: Formation, Evolution, Phenomena #General relativity #Hubble's law #Jerk #Mathematical physics #Metric expansion of space #Physics #Quantum mechanics #Theoretical physics #Type (biology) #Universe #Vacuum energy #gr-qc
paper · pdf · doi:10.1016/j.physletb.2011.02.046
published in Physics Letters B 697(5), 429-433 (Elsevier BV)
arxiv created 2010/11/26 · openalex publication_date 2011/02/23 · arxiv updated 2011/05/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Locally rotationally symmetric (L.R.S.) Bianchi type II stiff fluid cosmological model is investigated. To get the deterministic model of the universe, we have assumed a supplementary condition A=Bm between metric potentials A and B, where m is a constant. It is shown that the vacuum energy density Λ is positive and proportional to 1t2. The values of deceleration parameter q, matter-energy density Ωm and dark-energy density ΩΛ are found to be in good agreement with the values obtain from 5-years WMAP observations. The predicted value of the jerk parameter is in agreement with the SNLS SNIa and X-ray galaxy cluster distance data but it is not match with the SNIa gold sample data. In general, the model represent accelerating, shearing and non-rotating universe. The physical and geometrical behavior of this model is also discussed.