Dark energy with logarithmic cosmological fluid

Details Dark energy with logarithmic cosmological fluid Dark energy with logarithmic cosmological fluid

2012-01-22

arxiv.org/abs/1201.4544v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages, 1 figure

Scientific paper

We propose a dark energy model with a logarithmic cosmological fluid which can result in a very small current value of the dark energy density and avoid the coincidence problem without much fine-tuning. We construct a couple of dynamical models that could realize this dark energy at very low energy in terms of four scalar fields quintessence and discuss the current acceleration of the Universe. Numerical values can be made to be consistent with the accelerating Universe with adjustment of the two parameters of the theory. The potential can be given only in terms of the scale factor, but the explicit form at very low energy can be obtained in terms of the scalar field to yield of the form V(\phi)=\exp(-2\phi)(\frac{4 A}{3}\phi+B). Some discussions and the physical implications of this approach are given.

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