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physicsgg

Why is the Universe Accelerating?

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sean_carrolSEAN M. CARROLL
The universe appears to be accelerating, but the reason why is a complete mystery.
The simplest explanation, a small vacuum energy (cosmological constant), raises three difficult issues: why the vacuum energy is so small, why it is not quite zero, and why it is comparable to the matter density today.
I discuss these mysteries, some of their possible resolutions, and some issues confronting future observations….
… Read more at http://www.astro.caltech.edu/~george/ay21/readings/carroll.pdf

Written by physicsgg

July 8, 2013 at 9:14 am

Posted in COSMOLOGY, DARK ENERGY

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