Testing the running of non-Gaussianity through the CMB μ-distortion and the halo bias

Matteo Biagetti, Hideki Perrier, Antonio Riotto, and Vincent Desjacques
Phys. Rev. D 87, 063521 – Published 22 March 2013

Abstract

The primordial non-Gaussianity parameters fNL and τNL may be scale dependent. We investigate the capability of future measurements of the CMB μ distortion, which is very sensitive to small scales, and of the large-scale halo bias to test the running of local non-Gaussianity. We show that, for an experiment such as PIXIE, a measurement of the μ-temperature correlation can pin down the spectral indices nfNL and nτNL to values of the order of 0.3 if fNL=20 and τNL=5000. A similar value can be achieved with an all-sky survey extending to redshift z1. In the particular case in which the two spectral indices are equal, as predicted in models where the cosmological perturbations are generated by a single field other than the inflaton, the 1σ error on the scale dependence of the nonlinearity parameters goes down to 0.2.

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  • Received 15 January 2013

DOI:https://doi.org/10.1103/PhysRevD.87.063521

© 2013 American Physical Society

Authors & Affiliations

Matteo Biagetti, Hideki Perrier, Antonio Riotto, and Vincent Desjacques

  • Department of Theoretical Physics and Center for Astroparticle Physics (CAP), Université de Genève, 24 quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland

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Issue

Vol. 87, Iss. 6 — 15 March 2013

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