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SUMMARY:Non-Gaussianity in N-body simulations of large scale structures - 
 Marcel Schmittfull\, DAMTP
DTSTART:20120203T130000Z
DTEND:20120203T140000Z
UID:TALK34883@talks.cam.ac.uk
CONTACT:Xingang Chen
DESCRIPTION:Although today's best observational constraints on primordial 
 non-Gaussianity come from the CMB\, recent developments indicate that gala
 xy surveys can yield comparable or even better constraints in the near fut
 ure. To achieve this we need to understand how primordial non-Gaussianity 
 affects the formation of large scale structures\, in particular how it cha
 nges the power spectrum\, bispectrum and higher horder correlation functio
 ns of the dark matter and galaxy distribution. We present novel methods to
  generate general non-Gaussian initial conditions for N-body simulations a
 nd estimate the bispectrum in a model-independent manner. The methods are 
 based on a separable decomposition of the bispectrum\, which has been appl
 ied successfully to CMB bispectrum analyses\, and are significantly faster
  than previously used techniques\, allowing us to examine a wider range of
  scales. We show how this can be used to disentangle the primordial contri
 bution to the matter bispectrum from the late-time non-Gaussianity induced
  by non-linear gravitational evolution.
LOCATION:Pavilion B Potter Room (B1.19)
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