2-6 September 2019
Europe/Zurich timezone

Lensing limitations on primordial non-Gaussianity constraints

5 Sep 2019, 17:30
25m
Talk CMB, Universe Expansion, and Thermal History Parallel Sessions: CMB, Expansion Rate, Thermal History (C.A.R.L., H09)

Speaker

William Coulton

Description

Next generation cosmic microwave background (CMB) experiments will allow us to put the most stringent constraints on primordial non-Gaussianity (PNG). However as these experiments push to increasingly small scales we become increasingly sensitive to biases and noise from other sky signals, such as extragalactic sources and gravitational lensing. In this work we explore how lensing acts as a source of noise for PNG searches. This effect, originally reported in Babich and Zaldarriaga (2004), dominates the bispectrum noise for squeezed shapes at small scales. We explore how important this effect will be for the Simons Observatory and stage 4 experiments, and how delensing can be used to reduce this effect.

Primary authors

William Coulton Prof. P.D. Meerburg (University of Groningen) David Baker (Cambridge University) Alexander van Engelen

Presentation Materials