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Astrophys Space Sci (2010) 326: 155158 DOI 10.1007/s10509-009-0237-x
Interaction between phantom eld and modied Chaplygin gas
Surajit Chattopadhyay Ujjal Debnath
Received: 13 October 2009 / Accepted: 1 December 2009 / Published online: 5 December 2009 Springer Science+Business Media B.V. 2009
Abstract In this letter, we have considered a at FRW universe. Instead of considering only one candidate for the dark energy, we have considered the interaction between phantom eld and modied Chaplygin gas. It has been shown that the potential of the phantom eld increases from a lower value with evolution of the universe. It has been observed that the eld has an increasing tendency and the potential has also an increasing tendency with passage of cosmic time. In the evolution of the universe the crossing of w = 1 has been
realized by this interacting model.
Keywords Phantom eld Modied Chaplygin gas
Interaction
In recent observations it has been established that the universe is made up for roughly two-thirds of dark energy, which has a negative pressure and can drive the accelerating expansion of the Universe and a plethora of literature have described these facts (Cai and Wang 2005; Hao and Li 2003; de Bernardis et al. 2000; Bahcall et al. 1999). Numerous models have been proposed as candidates of this dark energy. Examples of such candidates for dark energy are vacuum energy, quintessence (Ratra and Peebles 1988; Hao and Li 2002; Zimdahl et al. 2001; Zlatev et al. 1999; Guo et al. 2005), phantom (Hao and Li 2005; Gonzalez
S. Chattopadhyay ( )
Department of Computer Application, Pailan College of Management and Technology, Kolkata-104, India e-mail: mailto:[email protected]
Web End [email protected]
U. DebnathDepartment of Mathematics, Bengal Engineering and Science University, Howrah-103, Indiae-mail: mailto:[email protected]
Web End [email protected]
and Quiros 2008) and Chaplygin gas (Guo and Zhang 2007; Debnath 2007; Chattopadhyay and Debnath 2008). In order to derive the accelerated expansion of the universe it is required to have w < 13. For the cosmological con
stant w = 1, for the quintessence model 1 < w < 13
and for the k-essence model w < 1 or w > 1. How
ever, it is physically impossible to cross w = 1 (Vikman
2005). Present observational data constrain the range of the equation of state of...