Is there Supernova Evidence for Dark Energy Metamorphosis ?

Details Is there Supernova Evidence for Dark Energy Metamorphosis ? Is there Supernova Evidence for Dark Energy Metamorphosis ?

2003-11-16

arxiv.org/abs/astro-ph/0311364v3

Mon.Not.Roy.Astron.Soc. 354 (2004) 275

Astronomy and Astrophysics

Astrophysics

20 pages, 21 figures. Discussions enhanced. Appendix added on error propagation with new figures. References updated. Main res

Scientific paper

10.1111/j.1365-2966.2004.08189.x

We reconstruct the equation of state $w(z)$ of dark energy (DE) using a recently released data set containing 172 type Ia supernovae without assuming the prior $w(z) \geq -1$ (in contrast to previous studies). We find that dark energy evolves rapidly and metamorphoses from dust-like behaviour at high $z$ ($w \simeq 0$ at $z \sim 1$) to a strongly negative equation of state at present ($w \lleq -1$ at $z \simeq 0$). Dark energy metamorphosis appears to be a robust phenomenon which manifests for a large variety of SNe data samples provided one does not invoke the weak energy prior $\rho + p \geq 0$. Invoking this prior considerably weakens the rate of growth of $w(z)$. These results demonstrate that dark energy with an evolving equation of state provides a compelling alternative to a cosmological constant if data are analysed in a prior-free manner and the weak energy condition is not imposed by hand.

Affiliated with

Also associated with

No associations

Rating

Is there Supernova Evidence for Dark Energy Metamorphosis ? 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 Is there Supernova Evidence for Dark Energy Metamorphosis ?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Is there Supernova Evidence for Dark Energy Metamorphosis ? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-635156