Probing Cosmic Origins with CO and [CII] Emission Lines

TL;DR

This paper explores how upcoming intensity mapping experiments of CO and [CII] emissions can significantly improve constraints on primordial non-Gaussianity, shedding light on early universe physics.

Contribution

It demonstrates that future intensity mapping of CO and [CII] can surpass current constraints on primordial non-Gaussianity from Planck data.

Findings

COMAP can achieve σ(f_NL^loc) = 3.4

PIXIE can achieve σ(f_NL^loc) = 3.9

Intensity mapping improves constraints on early universe models

Abstract

Primordial non-Gaussianity is an invaluable window into the physical processes that gave rise to the cosmological structure. The presence of local shape PNG imprints a distinct scale-dependent correction to the bias of dark matter tracers on large scales, which can be effectively probed via the technique of intensity mapping. Considering an upcoming generation of experiments, we demonstrate that intensity mapping of CO and [CII] emission can improve upon the current best constraints from the {\it Planck} satellite. We show that measurement of the CO intensity power spectrum by a hypothetical next stage of the ground-based COMAP experiment can achieve $\sigma(f_{\rm NL}^{\rm loc}) = 3.4$, and that the proposed CMB satellite mission PIXIE can achieve $\sigma(f_{\rm NL}^{\rm loc}) = 3.9$ via measurement of [CII] intensity power spectrum.