Abstract
We consider a new generalized Chaplygin gas model that includes the original Chaplygin gas model as a special case. In such a model the generalized Chaplygin gas evolves as from dust to quiescence or phantom. We show that the background evolution for the model is equivalent to that for a coupled dark energy model with dark matter. The constraints from the current type Ia supernova data favour a phantom-like Chaplygin gas model.
Highlights
Recent observations of type Ia supernovae (SNe Ia) suggest that the expansion of the universe is accelerating and that two-thirds of the total energy density exists in a dark energy component with negative pressure [1]
It is easy shown that the background evolution for the variable Chaplygin gas model is equivalent to that for an interaction model between the dark matter and the dark energy with w = −1 + n/6 [20]
We have considered a new generalized Chaplygin gas model
Summary
Recent observations of type Ia supernovae (SNe Ia) suggest that the expansion of the universe is accelerating and that two-thirds of the total energy density exists in a dark energy component with negative pressure [1]. One possible approach to constructing a viable model for dark energy is to associate it with a slowly evolving and spatially homogeneous scalar field φ, called “quintessence” [4, 5]. Compared to the original Chaplygin gas, in this generalized model (called as variable Chaplygin gas) the universe tends to be a quiessence-dominated (n > 0) [18] or phantom-dominated one (n < 0) [19] with constant equation of state parameter w = −1 + n/6. It is easy shown that the background evolution for the variable Chaplygin gas model is equivalent to that for an interaction model between the dark matter and the dark energy with w = −1 + n/6 [20].
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
