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29 March 2024
 
  » arxiv » astro-ph/0212145

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The Equivalence between Different Dark (Matter) Energy Scenarios
Arbab I. Arbab ;
Date 5 Dec 2002
Journal Astrophys.Space Sci. 291 (2004) 141-147 DOI: 10.1023/B:astr.0000032071.28745.5e
Subject astro-ph gr-qc hep-th
AbstractWe have shown that the phenomenological models with a cosmological constant of the type $Lambda=eta(frac{ddot R}{R})$ and $Lambda=3alpha H^2$, where $R$ is the scale factor of the universe and $H$ is the Hubble constant, are equivalent to a quintessence model with a scalar ($phi$) potential of the form $Vpropto phi^{-n}, n$ = constant. The equation of state of the cosmic fluid is described by these parameters ($alpha, eta, n$) only. The equation of state of the cosmic fluid (dark energy) can be determined by any of these parameters. The actual amount of dark energy will define the equation of state of the cosmic fluid. All of the three forms can give rise to cosmic acceleration depending the amount of dark energy in the universe.
Source arXiv, astro-ph/0212145
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