2012/04/25 by Anirudh Pradhan, Ajay Kumar Singh, Ajay Singh +1
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #physics.gen-ph
paper · pdf · doi:10.1007/s10773-012-1329-x
published as Int. J. Theor. Phys. Vol. 52, No. 1, (2013) 266-278 · 12 pages, 5 figures
arxiv created 2012/04/25 · openalex publication_date 2012/09/07 · arxiv updated 2013/01/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this paper we discuss the law of variation of scale factor a = (tket)(1)/(n) which yields a time-dependent deceleration parameter (DP) representing a new class of models that generate a transition of universe from the early decelerated phase to the recent accelerating phase. Exact solutions of Einstein's modified field equations with perfect fluid and heat conduction are obtained within the framework of Saez-Ballester scalar-tensor theory of gravitation and the model is found to be in good agreement with recent observations. We find, for n = 3, k = 1, the present value of DP in derived model as q0 = -0.67 which is very near to the observed value of DP at present epoch. We find that the time-dependent DP is sensible for the present day Universe and give an earmark description of evolution of universe. Some physical and geometric properties of the models are also discussed.