Dissecting the Scalar Cosmological Collider with the Cosmic Microwave Background

arXiv:2607.18369 · astro-ph.CO, gr-qc, hep-ex, hep-ph, hep-th · Submitted 2026-07-20 · Read on arXiv

Oliver H. E. Philcox

astro-ph.CO, gr-qc, hep-ex, hep-ph, hep-th

Submitted: 2026-07-20

Comments: 25 pages, 12 figures, submitted to Phys. Rev. D. Interactive bispectrum visualizer available at https://oliverphilcox.github.io/cosmological-collider-bispectra/

Code: https://github.com/oliverphilcox/Binned-Bispectrum-Shape

Project page: https://oliverphilcox.github.io/cosmological-collider-bispectra

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Bispectrum — 24× in this paper · explained in 3 episodes
• Non-Gaussianity — 8× in this paper · explained in 2 episodes
• Primordial non-Gaussianity — 3× in this paper · explained in 2 episodes
• Degeneracy — 2× in this paper · explained in 3 episodes
• Anisotropy — 1× in this paper · explained in 3 episodes
• Core — 1× in this paper · explained in 2 episodes
• Decoupling — 1× in this paper · explained in 2 episodes
• Interpretability — 1× in this paper · explained in 15 episodes
• Trace — 1× in this paper · explained in 2 episodes

Sources

• Oscillations in the CMB from Axion Monodromy Inflation
• Resonant Non-Gaussianity
• Non-Gaussianity from Step Features in the Inflationary Potential
• Correlating features in the primordial spectra
• Primordial perturbations and non-Gaussianities in DBI and general multi-field inflation
• The Effective Field Theory of Multifield Inflation
• Review of local non-Gaussianity from multi-field inflation
• Quasi-Single Field Inflation and Non-Gaussianities
• Productive Interactions: heavy particles and non-Gaussianity
• Chemical-Potential-Assisted Particle Production in FRW Spacetimes
• Cosmological Particle Production and Pairwise Hotspots on the CMB
• Particle Production During Inflation: Observational Constraints and Signatures
• Non-Gaussianity as a Particle Detector
• Cosmological Collider Physics
• Warm Inflation
• Dissipative effects in the Effective Field Theory of Inflation
• The Open Effective Field Theory of Inflation
• Primordial Non-Gaussianities from Inflation Models
• Quantum Primordial Standard Clocks
• Non-Gaussian features of primordial fluctuations in single field inflationary models

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