Dmitri Pogosyan1, J. Richard Bond2, Carlo Contaldi2
1Physics Department, University of Alberta, Edmonton, AB, T6G 2J1, Canada
2CITA, University of Toronto, Toronto, ON, M5S 3H8, Canada
Abstract.
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
wQ for the dynamical field Q which gives rise to dark energy, the CMB data is found
to give a weak upper bound wQ < −0.4 at 95% CL, however combined with SN1a
data it strongly favours wQ < −0.8, consistent with -term like behaviour.
http://arxiv.org/pdf/astro-ph/0301310.pdf
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