To USR or not to USR: An effective description of two-field dynamics

arXiv:2609.26754 · astro-ph.CO, gr-qc, hep-ph, hep-th · Submitted 2026-09-22 · Read on arXiv

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

Submitted: 2026-09-22

Updated: 2026-09-22

Comments: 11 pages, 5 figures, 3 appendices

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

Terminology

• Quantization — 4× in this paper · explained in 12 episodes
• Decoupling — 3× in this paper · explained in 2 episodes
• Fine-Tuning — 3× in this paper · explained in 5 episodes
• Accuracy — 1× in this paper · explained in 1 episode
• Spectral Distortions — 1× in this paper · explained in 2 episodes

Sources

• Planck 2018 results. X. Constraints on inflation
• Primordial Black Holes as a dark matter candidate
• Primordial Black Holes
• Stochastic Gravitational Wave Backgrounds
• Scalar induced gravitational waves review
• Improved Estimates of Cosmological Perturbations
• Ultra slow-roll inflation demystified
• Anatomy of single-field inflationary models for primordial black holes
• Primordial black holes from single field models of inflation
• Single Field Double Inflation and Primordial Black Holes
• On primordial black holes from an inflection point
• Primordial black hole dark matter from single field inflation
• Primordial Black Holes from Polynomial Potentials in Single Field Inflation
• Planck scale black hole dark matter from Higgs inflation
• Primordial Black Holes from a tiny bump/dip in the Inflaton potential
• Inflation Dynamics and Reheating
• Light Scalar Fields Foster Production of Primordial Black Holes
• Primordial Black Holes from Inflation with a Spectator Field
• Spectator Axions in String Inflation and Primordial Black Holes
• Primordial black holes from single-field inflation: a fine-tuning audit

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