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What We Know About Dark Energy From Supernovae

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Title What We Know About Dark Energy From Supernovae
Author Alex Filippenko
Publisher Fermi National Accelerator Laboratory (Fermilab)
Release Date 2008
Language English

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Subject Area Physics
Abstract The measured distances of type Ia (white dwarf) supernovae as a function of redshift (z) have shown that the expansion of the Universe is currently accelerating, probably due to the presence of dark energy (X) having a negative pressure. Combining all of the data with existing results from large-scale structure surveys, we find a best fit for Omega M and Omega X of 0.28 and 0.72 (respectively), in excellent agreement with the values derived independently from WMAP measurements of the cosmic microwave background radiation. Thus far, the best-fit value for the dark energy equation-of-state parameter is -1, and its first derivative is consistent with zero, suggesting that the dark energy may indeed be Einstein's cosmological constant.
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