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The State of the Dark Energy Equation of State

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arxiv astro-ph/0211522 v3 pith:IW5P4QWD submitted 2002-11-24 astro-ph gr-qchep-phhep-th

The State of the Dark Energy Equation of State

classification astro-ph gr-qchep-phhep-th
keywords statedarkdataenergyequationhubbleparameteralthough
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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By combining data from seven cosmic microwave background experiments (including the latest WMAP results) with large scale structure data, the Hubble parameter measurement from the Hubble Space Telescope and luminosity measurements of Type Ia supernovae we demonstrate the bounds on the dark energy equation of state $w_Q$ to be $-1.38< w_Q <-0.82$ at the 95% confidence level. Although our limit on $w_Q$ is improved with respect to previous analyses, cosmological data does not rule out the possibility that the equation of state parameter $w_Q$ of the dark energy $Q$ is less than -1. We present a tracking model that ensures $w_Q \le -1$ at recent times and discuss the observational consequences.

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