title: First constraints on the running of non-Gaussianity.
abstract: We use data from the Wilkinson Microwave Anisotropy probe temperature maps to constrain a scale-dependent generalization of the popular "local" model for primordial non-Gaussianity. In the model where the parameter f(NL) is allowed to run with scale k, f(NL)(k) = f*(NL) (k/k(piv))(n)(fNL), we constrain the running to be n(f)(NL) = 0.30(-1.2)(+1.9) at 95% confidence, marginalized over the amplitude f*(NL). The constraints depend somewhat on the prior probabilities assigned to the two parameters. In the near future, constraints from a combination of Planck and large-scale structure surveys are expected to improve this limit by about an order of magnitude and usefully constrain classes of inflationary models.
authors.affiliation: Department of Physics, University of Michigan, Ann Arbor, 48109-1040, USA. beckeram@umich.edu
authors.forename: Adam
authors.initials: A
authors.lastname: Becker
authors.forename: Dragan
authors.initials: D
authors.lastname: Huterer