arXiv (OAI Expanded)
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Running into tension: primordial black holes from ultra-slow-roll inflation, spectral running, and the Hubble tension
cosmology-and-nongalactic-astrophysicsgeneral-relativity-and-quantum-cosmologyhigh-energy-physics-phenomenologyhigh-energy-physics-theory
Single-field ultra-slow-roll (USR) inflation is among the most studied mechanisms for primordial black hole (PBH) formation. When a non-stationary inflection point close to CMB scales is present, these models predict a negative spectral running ($α_s<0$), whose magnitude increases with the PBH mass.
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