# DPF 2011

8-13 August 2011
Rhode Island Convention Center
US/Eastern timezone

## Testing Inflation with Dark Matter Halos (Primordial Non-Gaussianity in Large-scale Structure)

12 Aug 2011, 08:40
20m
556 (Rhode Island Convention Center)

### 556

#### Rhode Island Convention Center

Parallel contribution Particle Astrophysics and Cosmology

### Speaker

Dr Marilena Loverde (Institute for Advanced Study)

### Description

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 g_NL'' model where cancellations vanish the usual quadratic f_NL term in the potential, but give rise to a large cubic term.

### Primary author

Dr Marilena Loverde (Institute for Advanced Study)

 Slides