Upcoming Events

Testing Inflation with Large-scale Structure

January 29, 2013 12:00PM to 1:00PM
Presenter 
Marilena Loverde, University of Chicago
Location 
Building 362, Room F108
Type 
Seminar
Series 
HEP Lunch Seminar
Abstract:
Cosmic inflation provides a mechanism for generating the early density perturbations that seeded the large-scale structures we see today. Primordial non-Gaussianity is among the most promising of few observational tests of physics at this epoch. At present non-Gaussianity is best constrained by the cosmic microwave background, but in the near term large-scale structure data may be competitive so long as the effects of primordial non-Gaussianity can be modeled through the non-linear process of structure formation. I will discuss recent work modeling effects of a few types of primordial non-Gaussianity on the large-scale halo clustering and the halo mass function.

More specifically, I will compare analytic and N-body results for two variants of the curvaton model of inflation:

  • (i) a tau NL scenario in which the curvaton and inflaton contribute equally to the primordial curvature perturbation and
  • (ii) a gNL model where cancellations vanish the usual quadratic fNL term in the potential, but give rise to a large cubic term.