FRW viscous modified cosmic Chaplygin gas cosmology in the presence of cosmological constant
| Autor: | G. S. Khadekar, Kalpana Pande, Aina Gupta |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Chaplygin gas
Physics COSMIC cancer database Physics and Astronomy (miscellaneous) 010308 nuclear & particles physics media_common.quotation_subject Astrophysics::Cosmology and Extragalactic Astrophysics Cosmological constant Volume viscosity 01 natural sciences Universe Cosmology symbols.namesake Friedmann–Lemaître–Robertson–Walker metric 0103 physical sciences symbols 010303 astronomy & astrophysics Mathematical physics media_common |
| Zdroj: | International Journal of Geometric Methods in Modern Physics. 16:1950141 |
| ISSN: | 1793-6977 0219-8878 |
| DOI: | 10.1142/s021988781950141x |
| Popis: | In this paper, we study viscous Modified Cosmic Chaplygin Gas (MCCG) in the presence of cosmological constant in flat FRW universe. We assume that bulk viscosity [Formula: see text] and cosmological constant [Formula: see text] are the linear combinations of two terms, one is constant and other is a function of dark energy density [Formula: see text]. In this framework, we solve the non-linear differential equation analytically and numerically and obtain time dependent dark energy density. We also consider two separate cases of early and late universe and discussed the evolution of dark energy density. We investigate the effect of viscosity and cosmological constant to the evolution of universe and discuss the stability of the model by square of speed of sound. Finally, we compare our model with Cardassian universe. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|