Searching for Folded Primordial Non-Gaussianity with Galaxy Surveys

arXiv:2607.15337 · astro-ph.CO, gr-qc, hep-ph, hep-th · Submitted 2026-07-16 · Read on arXiv

Si-Xiang Yang, Oliver H. E. Philcox

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

Submitted: 2026-07-16

Comments: 24 pages, 7 figures. Comments welcome!

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

Terminology

• Bispectrum — 77× in this paper · explained in 3 episodes
• Non-Gaussianity — 39× in this paper · explained in 2 episodes
• Core — 33× in this paper · explained in 2 episodes
• Primordial non-Gaussianity — 19× in this paper · explained in 2 episodes
• Clustering — 14× in this paper · explained in 2 episodes
• Consistency — 5× in this paper · explained in 3 episodes
• Abundance — 2× in this paper · explained in 1 episode
• Matter Power Spectrum — 2× in this paper · explained in 2 episodes
• Trace — 2× in this paper · explained in 2 episodes
• Anisotropy — 1× in this paper · explained in 3 episodes
• Anti-correlation — 1× in this paper · explained in 3 episodes
• Calibration — 1× in this paper · explained in 7 episodes
• Decoupling — 1× in this paper · explained in 2 episodes
• Entanglement — 1× in this paper · explained in 3 episodes
• Fisher Information — 1× in this paper · explained in 3 episodes
• New Physics Hypersphere — 1× in this paper
• Quantization — 1× in this paper · explained in 12 episodes
• Symmetry Breaking — 1× in this paper · explained in 3 episodes

Sources

• What would we learn by detecting a gravitational wave signal in the cosmic microwave background anisotropy?
• BICEP / Keck XIII: Improved Constraints on Primordial Gravitational Waves using Planck, WMAP, and BICEP/Keck Observations through the 2018 Observing Season
• How Gaussian can our Universe be?
• Non-Gaussian features of primordial fluctuations in single field inflationary models
• Observational Signatures and Non-Gaussianities of General Single Field Inflation
• Non-Gaussianity from Inflation: Theory and Observations
• Generating the curvature perturbation without an inflaton
• Adiabatic CMB perturbations in pre-big bang string cosmology
• Effects of Cosmological Moduli Fields on Cosmic Microwave Background
• The Effective Field Theory of Inflation
• Running Non-Gaussianities in DBI Inflation
• Enhanced Non-Gaussianity from Excited Initial States
• Signatures of Initial State Modifications on Bispectrum Statistics
• Bispectrum signatures of a modified vacuum in single field inflation with a small speed of sound
• Non-Gaussianity from Excited Initial Inflationary States
• Optimal CMB estimators for bispectra from excited states
• Extracting New Physics from the CMB
• Decoupling in an expanding universe: boundary RG-flow affects initial conditions for inflation
• Folded Resonant Non-Gaussianity in General Single Field Inflation
• Looking for non-Gaussianity in all the right places: A new basis for non-separable bispectra

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