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Unformatted text preview: – Universe is accelerating! – Cosmological Constant Λ exists – Vacuum repulsion energy! Overlap of 2 studies (arrow) gives us best estimate to date for Ω Λ & Ω M • Clustering of galaxies already told us Ω MATTER ≈ 0.3 – Only 30% of energy content of Universe is in the form of known or hypothesized types of matter – So: What is the "dark energy"? Matter Density Density from “ Cosmological Constant ” Data from Supernova studies: Composition of our Universe 67 95% To astronomers, any element above lithium (Z=3) is “ heavy ”...
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- Fall '09
- Physics, Big Bang, Redshift, Physical cosmology, Vacuum repulsion energy