Non-Linear Equation of State and Effective Phantom Divide in Brane Models |
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| Authors: | Jibitesh Dutta Subenoy Chakraborty and M Ansari |
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| Institution: | 1.Department of Basic Sciences and Social Sciences,North Eastern Hill University,Shillong,India;2.Department of Mathematics,Jadavpur University,Kolkata-32,India;3.Department of Mathematics,North Eastern Hill University,Shillong,India |
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| Abstract: | Here, DGP model of brane-gravity is analysed and compared with the standard general relativity and Randall-Sundrum cases using
non-linear equation of state. Phantom fluid is known to violate the weak energy condition. In this paper, it is found that
this characteristic of phantom energy is affected drastically by the negative brane-tension λ of the RS-II model. It is found that in DGP model strong energy condition (SEC) is always violated and the universe accelerates
only where as in RS-II model even SEC is not violated for 1<ρ/λ<2 and the universe decelerates. |
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