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Analysis of Possible Evolution of Dark Energy by Using a Power Series |
| WANG Wei;GUI Yuan-Xing;SHAO Ying |
| School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 |
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| Cite this article: |
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WANG Wei, GUI Yuan-Xing, SHAO Ying 2007 Chin. Phys. Lett. 24 1414-1416 |
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Abstract We simulate the density of dark energy by using a power series to analyse the possible evolution of dark energy. The parameters are constrained from the newly released Gold sample of the supernova dataset. The evolutions of dark energy, as the power series from two free parameters to five free parameters, have the common and the different characters. We may conclude that either the density of dark energy possibly oscillates or increases after
it decreases to a minimum value. Accordingly, the state equation of dark energy oscillates or evolves from ωde>-1 in the past to ωde<-1 around the present epoch.
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| Keywords:
95.36.+x
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Received: 19 January 2007
Published: 23 April 2007
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