Status Report

Limits on the Dark Energy Parameters from Cosmic Microwave Background experiments

By SpaceRef Editor
January 17, 2003
Filed under , ,

Astrophysics, abstract
astro-ph/0301310


From: Dmitri Pogosyan <[email protected]>
Date: Thu, 16 Jan 2003 00:34:17 GMT (25kb)

Limits on the Dark Energy Parameters from Cosmic Microwave Background
experiments


Authors:
D. Pogosyan,
J.R. Bond,
C.R. Contaldi

Comments: 4 pages, 2 figures, to appear in the Proceedings of the XVIII IAP
Colloquium `On the nature of dark energy’, Paris, 1-5 July 2002


Full suite of the present day Cosmic Microwave background (CMB) data, when
combined with weak prior information on the Hubble constant and the age of the
Universe, or the Large-Scale structure, provides strong indication for a
non-zero density of the vacuum-like dark energy in our universe. This result
independently supports the conclusions from Supernovae Ia (SN1a) data. When the
model parameter space is extended to allow for the range of the equation of
state parameter w_Q for the dynamical field Q which gives rise to dark energy,
the CMB data is found to give a weak upper bound w_Q < -0.4 at 95% CL, however
combined with SN1a data it strongly favours w_Q < -0.8, consistent with
Lambda-term like behaviour.

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