Running into tension: primordial black holes from ultra-slow-roll inflation, spectral running, and the Hubble tension

arXiv:2606.31362 · astro-ph.CO, gr-qc, hep-ph, hep-th · Submitted 2026-06-30 · Read on arXiv

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

Submitted: 2026-06-30

Updated: 2026-08-26

Comments: 23 pages, 7 sub-figures arranged into 4 figures

Code: https://github.com/lesgourg/class

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

Terminology

Hubble Tension — 40× in this paper · explained in 9 episodes
Benchmark — 12× in this paper · explained in 2 episodes
alpha — 6× in this paper · explained in 1 episode
Abundance — 5× in this paper · explained in 1 episode
ACT Data — 4× in this paper · explained in 1 episode
Atacama Cosmology Telescope — 4× in this paper
Cosmic Microwave Background — 3× in this paper
Degeneracy — 3× in this paper · explained in 3 episodes
Consistency — 2× in this paper · explained in 3 episodes
Baryon Acoustic Oscillations — 1× in this paper
Cooperation — 1× in this paper · explained in 2 episodes
Core — 1× in this paper · explained in 2 episodes
Decoupling — 1× in this paper · explained in 2 episodes
Fine-Tuning — 1× in this paper · explained in 5 episodes
Microlensing — 1× in this paper · explained in 2 episodes
Primordial Black Holes (PBHs) — 1× in this paper · explained in 7 episodes
Robustness — 1× in this paper · explained in 5 episodes
Trace — 1× in this paper · explained in 2 episodes
pulsar timing arrays — 1× in this paper · explained in 2 episodes

Sources

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