CfA Colloquium Schedule Spring 2008
 28 February 2008

28 February 2008

Speaker: Rocky Kolb (U. Chicago, KICP)

Title: Taking Sides on the Dark Energy Issue
Note: due to a technical problem, the video begins ~10 mins. into the talk.

Abstract: In the standard cosmological model, LambdaCDM, roughly 70% of the present mass/energy density of the universe is in the form of dark energy, or a cosmoillogical constant. But there are a number of other explanations for the observations, including modification of gravity, quintessence, and altering the Friedmann equation. Some of the possibilities have no dark energy, and in some of the solutions the expansion of the universe is not even accelerating. Theorists look to astronomers for direction. "Nothing more can be done by the theorists. In this matter it is only you, the astronomers, who can perform a simply invaluable service to theoretical physics."

Video of the Presentation (Talks can be viewed with RealPlayer. Free download is available from )


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