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What We Know About Dark Energy From Supernovae


Formale Metadaten

Titel What We Know About Dark Energy From Supernovae
Autor Alex Filippenko
Herausgeber Fermi National Accelerator Laboratory (Fermilab)
Erscheinungsjahr 2008
Sprache Englisch

Inhaltliche Metadaten

Fachgebiet Physik
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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