Why Is the Universe Accelerating?

Details Why Is the Universe Accelerating? Why Is the Universe Accelerating?

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aps..apr.b4003c&link_type=abstract

American Physical Society, APS April Meeting, April 22-26, 2006, abstract #B4.003

Mathematics

Logic

Scientific paper

Our universe is accelerating, a phenomenon that cannot be accounted for by ordinary matter and conventional gravity. The simplest explanation is to invoke a vacuum energy of 120 orders of magnitude less than the expected amount. Alternatively, there could be a smoothly-distributed, slowly-varying dynamical component, or a breakdown of general relativity on cosmological scales. All of the possibilities are very exciting, and future observations have promise for distinguishing between them. I will give an overview of the theoretical proposals for explaining the acceleration of the universe and the observational constraints which any model must satisfy.

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