Kinetically Driven Quintessence

Details Kinetically Driven Quintessence Kinetically Driven Quintessence

1999-12-22

arxiv.org/abs/astro-ph/9912463v2

Phys.Rev.D62:023511,2000

Astronomy and Astrophysics

Astrophysics

18 pages, minor changes, to be published in Physical Review D

Scientific paper

10.1103/PhysRevD.62.023511

Recently, a novel class of models for inflation has been found in which the inflationary dynamics is driven solely by (non-canonical) kinetic terms rather than by potential terms. As an obvious extension, we show that a scalar field with non-canonical kinetic terms alone behaves like an energy component which is time-varying and has negative pressure presently, i.e. quintessence. We present a model which has a constant equation of state, that is, a ``kinetic'' counterpart of the Ratra-Peebles model of a quintessence field with a potential term. We make clear the structure of the phase plane and show that the quintessential solution is a late-time attractor. We also give a model for the ``phantom'' component which has an equation of state with $w=p/\rho <-1$.

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