Constraints on $\tau_\mathrm{NL}$ from Planck temperature and polarization
Cosmology and Nongalactic Astrophysics
2022-08-17 v1
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 via likelihood methods, demonstrating the procedures effectiveness by inferring known signal(s) from simulations. Our baseline results constrain at the 95\% confidence level, providing the most stringent constraints to date.
Keywords
Cite
@article{arxiv.2205.14408,
title = {Constraints on $\tau_\mathrm{NL}$ from Planck temperature and polarization},
author = {Kareem Marzouk and Antony Lewis and Julien Carron},
journal= {arXiv preprint arXiv:2205.14408},
year = {2022}
}