Constraints on τNL from Planck temperature and polarization. Issue 8 (1st August 2022)

• Record Type: Journal Article
• Authors: Marzouk, Kareem; Lewis, Antony; Carron, Julien
• Is Part Of: Journal of cosmology and astroparticle physics. Volume 2022:Issue 8(2022)
• Publication Date: 2022-08-01
• Subjects: Inflation and CMBR theory -- non-gaussianity; Cosmology -- Periodicals; Astrophysics -- Periodicals; 523.0105
• DOI: 10.1088/1475-7516/2022/08/015
• Languages: English
• ISSNs: 1475-7516

Abstract

Abstract: We update constraints on the amplitude of the primordial trispectrum, using the final Planck mission temperature and polarization data. In the squeezed limit, a cosmological local trispectrum would be observed as a spatial modulation of small-scale power on the CMB sky. We reconstruct this signal as a source of statistical anisotropy via quadratic estimator techniques. We systematically demonstrate how the estimated power spectrum of a reconstructed modulation field can be translated into a constraint on τ NL via likelihood methods, demonstrating the procedures effectiveness by inferring known τ NL signal(s) from simulations. Our baseline results constrain τ NL < 1700 at the 95% confidence level, providing the most stringent constraints to date.