2017/01/31 by Subhajit Saha, Saumya Ghosh, Sunandan Gangopadhyay · 1 citation
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Astrophysics and Star Formation Studies #Barotropic fluid #Chaplygin gas #Constant (computer programming) #Cosmology and Gravitation Theories #Dark energy #Energy (signal processing) #Equation of state #Phase transition #Work (physics) #physics.gen-ph
paper · pdf · doi:10.1142/s0217732317501097
published as Modern Physics Letters A 32, 1750109 (2017) · 8 pages, 6 figures; v2: Text expanded, Discussion improved, Conclusions modified, References updated; v3: Comments regarding model parameters and redshift of transition added following reviewer suggestions, Identical to published version
openalex created_date 2017/03/16 · openalex publication_date 2017/06/21 · arxiv created 2017/07/16 · arxiv updated 2017/07/18 · openalex updated_date 2026/08/05
In this paper, the implications of considering interaction between Chaplygin gas and a barotropic fluid with constant equation of state have been explored. The unique feature of this work is that assuming an interaction [Formula: see text], analytic expressions for the energy density and pressure have been derived in terms of the hypergeometric [Formula: see text] function. It is worthwhile to mention that an interacting Chaplygin gas model was considered in 2006 by Zhang and Zhu, nevertheless, analytic solutions for the continuity equations could not be determined assuming an interaction proportional to [Formula: see text] times the sum of the energy densities of Chaplygin gas and dust. Our model can successfully explain the transition from the early decelerating phase to the present phase of cosmic acceleration. Arbitrary choice of the free parameters of our model through trial and error shows that recent observational data strongly favors [Formula: see text] and [Formula: see text] over the [Formula: see text] case. Interestingly, the present model also incorporates the transition of dark energy into the phantom domain, however, future deceleration is forbidden.