Tuesday, September 23, 2008, 3:30 pm — Large Seminar Room, Bldg. 510
Cosmologists are struggling to understand whether the current accelerated expasion of the Universe is due to Dark Energy filling space, or to failure of General Relativity (GR) on large scales. I will review some of the explanations which have been proposed, and focus on the possibility of distinguishing between these two cases using different observational probes. I will explain how it is crucial to combine measurements of both distances and growth of structure in this respect, since the relation between them can be exactly predicted, and therefore tested, in GR. I will introduce a null parameter test of GR that can be measured using redshift galaxy surveys, and show how the upcoming SDSS-III (BOSS) survey and the proposed ADEPT mission will be able to constrain it at the few percent level.
Hosted by: Morgan May
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