Tangled tau: Planck CMB Constraints on Flash Reionization

arXiv:2609.24989 · astro-ph.CO · Submitted 2026-09-21 · Read on arXiv

astro-ph.CO

Submitted: 2026-09-21

Updated: 2026-09-21

Comments: 10 pages, 8 figures

Code: https://github.com/CobayaSampler/cobaya

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

Terminology

• Benchmark — 22× in this paper · explained in 2 episodes
• Markov Chain Monte Carlo — 3× in this paper
• Monte Carlo Analysis — 2× in this paper · explained in 2 episodes
• Abundance — 1× in this paper · explained in 1 episode
• Anisotropy — 1× in this paper · explained in 3 episodes
• Degeneracy — 1× in this paper · explained in 3 episodes

Sources

• DESI DR2 Results II: Measurements of Baryon Acoustic Oscillations and Cosmological Constraints
• SPT-3G D1: CMB temperature and polarization power spectra and cosmology from 2019 and 2020 observations of the SPT-3G Main field
• The BAO-CMB Tension and Implications for Inflation
• On the tension between DESI DR2 BAO and CMB
• Turning a negative neutrino mass into a positive optical depth
• Dispu$\tau$able: the high cost of a low optical depth
• A small and vigorous black hole in the early Universe
• A high black hole to host mass ratio in a lensed AGN in the early Universe
• Flash Ionization of the Early Universe by Pop III.1 Supermassive Stars
• The Impact of Population III.1 Flash Reionization for CMB Polarization and Thomson Scattering Optical Depth
• Fireworks at Cosmic Dawn: relieving BAO-CMB tensions with the Pop III.1 Flash
• The formation of supermassive black holes from Population III.1 seeds. IV. Self-regulated seeding from supermassive star ionizing feedback
• Overmassive black holes and little red dots naturally form in simulations
• The Universe Was Reionized Twice
• Reionization of Hydrogen and Helium by Early Stars and Quasars
• The Reionization History at High Redshifts II: Estimating the Optical Depth to Thomson Scattering from CMB Polarization
• Late reionizations of the Universe and their manifestation in the CMB data
• Cosmic Microwave Background Polarization and reionization: constraining models with a double reionization
• Is Double Reionization Physically Plausible?
• Cosmological parameters from WMAP 5-year temperature maps

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