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PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

PIRSA:10040042  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Primordial Non-Gaussianity and Large-Scale Structure
Speaker(s): Neal Dalal
Abstract: The primordial density fluctuations that seeded large-scale structure are known to be nearly Gaussian, as predicted by most early universe models like slow-roll inflation. Many of these models predict a small (but nonzero!) amount of primordial non-gaussianity, which can subtly affect the statistics of CMB anisotropies. Surprisingly, even a small primordial non-gaussianity can produce enormous changes in the large-scale clustering of galaxies and quasars at late times. I will describe the origin of this effect, and review recent constraints on non-gaussianity using measurements of the clustering of galaxies and quasars in SDSS.
Date: 14/04/2010 - 2:00 pm
Series: Colloquium
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