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CMB constraints on running non-Gaussianity

F. Oppizzi, M. Liguori, A. Renzi, F. Arroja, N. Bartolo

We develop a complete set of tools for CMB forecasting, simulation and estimation of primordial running bispectra, arising from a variety of curvaton and single-field (DBI) models of Inflation. We validate our pipeline using mock CMB running non-Gaussianity realizations and test it on real data by obtaining experimental constraints on the fNL running spectral index, nNG, using WMAP 9-year data. Our final bounds (68% C.L.) read −0.6< nNG<1.4}, −0.3< nNG<1.2, −1.1<nNG<0.7 for the single-field curvaton, two-field curvaton and DBI scenarios, respectively. We show forecasts and discuss potential improvements on these bounds, using Planck and future CMB surveys.

non-gaussianity; CMBR experiments; inflation; physics of the early universe

Journal of Cosmology and Astroparticle Physics
Volume 05, Issue 045, Page 20
2018 May

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia