Searching for Cosmological Collider in the Planck CMB Data
Wuhyun Sohn, Dong-Gang Wang, James R. Fergusson, E. P. S. Shellard

TL;DR
This paper conducts the first comprehensive analysis of Planck CMB data to search for signatures of heavy particles from the early universe, using novel templates and a specialized pipeline, but finds no significant evidence yet.
Contribution
It introduces new analytic bispectrum templates based on cosmological collider physics and applies an advanced pipeline to search for these signals in Planck data.
Findings
No significant cosmological collider signals detected in Planck data.
Established constraints on new heavy particles during inflation.
Demonstrated the potential of future surveys to discover such signals.
Abstract
In this paper, we present the first comprehensive CMB data analysis of cosmological collider physics. New heavy particles during inflation can leave imprints in the primordial correlators which are observable in today's cosmological surveys. This remarkable detection channel provides an unsurpassed opportunity to probe new physics at extremely high energies. Here we initiate the search for these relic signals in the cosmic microwave background (CMB) data from the Planck legacy release. On the theory side, guided by recent progress from the cosmological bootstrap, we first propose a family of analytic bispectrum templates that incorporate the distinctive signatures of cosmological collider physics. Our consideration includes the oscillatory signals in the squeezed limit, the angular dependence from spinning fields, and several new shapes from nontrivial sound speed effects. On the…
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Taxonomy
TopicsCosmology and Gravitation Theories · Radio Astronomy Observations and Technology · Computational Physics and Python Applications
