Dark energy from a quintessence (phantom) field rolling near potential minimum (maximum)

Details Dark energy from a quintessence (phantom) field rolling near potential minimum (maximum) Dark energy from a quintessence (phantom) field rolling near potential minimum (maximum)

2009-03-19

arxiv.org/abs/0903.3412v1

Phys.Rev.D79:103005,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, 10 figures

Scientific paper

10.1103/PhysRevD.79.103005

We examine dark energy models in which a quintessence or a phantom field, $\phi$, rolls near the vicinity of a local minimum or maximum, respectively, of its potential $V(\phi)$. Under the approximation that $(1/V)(dV/d\phi) \ll 1$, [although $(1/V)(d^2 V/d\phi^2)$ can be large], we derive a general expression for the equation of state parameter $w$ as a function of the scale factor for these models. The dynamics of the field depends on the value of $(1/V)(d^2 V/d\phi^2)$ near the extremum, which describes the potential curvature. For quintessence models, when $(1/V)(d^2 V/d\phi^2)<3/4$ at the potential minimum, the equation of state parameter $w(a)$ evolves monotonically, while for $(1/V)(d^2 V/d\phi^2)>3/4$, $w(a)$ has oscillatory behavior. For phantom fields, the dividing line between these two types of behavior is at $(1/V)(d^2 V/d\phi^2) = -3/4$. Our analytical expressions agree within 1% with the exact (numerically-derived) behavior, for all of the particular cases examined, for both quintessence and phantom fields. We present observational constraints on these models.

Affiliated with

Also associated with

No associations

Rating

Dark energy from a quintessence (phantom) field rolling near potential minimum (maximum) does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Dark energy from a quintessence (phantom) field rolling near potential minimum (maximum), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dark energy from a quintessence (phantom) field rolling near potential minimum (maximum) will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-641248