Scale dependence of local fNL

  title={Scale dependence of local fNL},
  author={C. Byrnes and S. Nurmi and G. Tasinato and D. Wands},
  journal={Journal of Cosmology and Astroparticle Physics},
We consider possible scale-dependence of the non-linearity parameter fNL in local and quasi-local models of non-Gaussian primordial density perturbations. In the simplest model where the primordial perturbations are a quadratic local function of a single Gaussian field then fNL is scale-independent by construction. However scale-dependence can arise due to either a local function of more than one Gaussian field, or due to non-linear evolution of modes after horizon-exit during inflation. We… Expand
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