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Abstract: Here Randall-Sundrum brane-gravity models of the homogeneous and flatuniverse, dominated by phantom fluid, is considered. It is noted thatbrane-gravity corrections effect the behaviour of phantom fluid in RS-II modelwhere brane-tension $\lambda$ is negative drastically. It is interesting tosee that, phantom fluid violates the weak energy condition WEC till energydensity $ ho < \lambda$, but when phantom energy density $ ho$ grows more,the effective equation of state does not violate WEC. Moreover, with increasingphantom energy density, a stage comes when even strong energy condition is notviolated due to effect of these corrections. Also expansion stops, when $ ho =2 \lambda$. As a consequence, RS-II phantom universe accelerates upto a finitetime explaining the present cosmic acceleration, but it decelerates later.Thus,RS-II phantom universe is singularity-free. In the case of RS-I model, where$\lambda$ is positive, characteristics of phantom fluid is not suppressed bybrane-corrections and phantom universe accelerates ending up in big-ripsingularity in finite future time.



Autor: S. K. Srivastava

Fuente: https://arxiv.org/







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