Quintessence as k-essence

Details Quintessence as k-essence Quintessence as k-essence

2004-11-10

arxiv.org/abs/astro-ph/0411258v2

Phys.Lett.B631:93-99,2005

Astronomy and Astrophysics

Astrophysics

14 pages, improved discussion, matches published version

Scientific paper

10.1016/j.physletb.2005.10.011

Quintessence and k-essence have been proposed as candidates for the dark energy component of the universe that would be responsible of the currently observed accelerated expansion. In this paper we investigate the degree of resemblance between those two theoretical setups, and find that every quintessence model can be viewed as a k-essence model generated by a kinetic linear function. In addition, we show the true effects of k-essence begin at second order in the expansion of the kinetic function in powers of the kinetic energy.

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