Inflation as a Critical Phenomenon: A Distinctive Bispectrum Signature from Granular Entropic Physics

Key Points

• The study aims to understand the origin of cosmological perturbations through Granular Entropic Physics.
• Proposed a model connecting critical points in discrete spacetime networks to cosmological perturbations.
• Analyzed curvature perturbation as an energy operator in a 3D Ising-like conformal field theory.
• Calculated the bispectrum prediction in the squeezed limit.
• Predicted that the primordial bispectrum scales as (k1/k2)^1.4 in the squeezed limit.
• Found that this signal is undetectable in the Cosmic Microwave Background (CMB) but can be seen in future 21cm surveys.
• Highlighted the contrast with the nearly flat behavior of single-field inflation.

Abstract