Fireworks at Cosmic Dawn: relieving BAO-CMB tensions with the Pop III.1 Flash

arXiv:2606.19459 · astro-ph.CO, astro-ph.GA · Submitted 2026-06-17 · Read on arXiv

Yash Aggarwal, Christopher Cain, Garett Lopez, Hy Trac, Anson D'Aloisio, Philip Tanedo, Jonathan C. Tan

astro-ph.CO, astro-ph.GA

Submitted: 2026-06-17

Comments: 12 pages, 5 figures. Submitted to ApJL, comments welcome

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

Terminology

• Clustering — 14× in this paper · explained in 2 episodes
• Abundance — 6× in this paper · explained in 1 episode
• Consistency — 3× in this paper · explained in 3 episodes
• Cosmic Microwave Background — 3× in this paper
• Adam — 2× in this paper · explained in 2 episodes
• South Pole Telescope — 2× in this paper
• Trace — 2× in this paper · explained in 2 episodes
• alpha — 2× in this paper · explained in 1 episode
• Anisotropy — 1× in this paper · explained in 3 episodes
• Benchmark — 1× in this paper · explained in 2 episodes
• CMB and Dark Energy Spectroscopic Instrument — 1× in this paper
• Texas Advanced Computing Center — 1× in this paper

Sources

• Positive neutrino masses with DESI DR2 via matter conversion to dark energy
• The CMB optical depth constrains the duration of reionization
• SPT-3G D1: A Measurement of Secondary Cosmic Microwave Background Anisotropy Power
• It's All ${\tt Ok}$: Curvature in Light of BAO from DESI DR2
• DESI DR2 Results II: Measurements of Baryon Acoustic Oscillations and Cosmological Constraints
• Rapid late-time reionization: constraints and cosmological implications
• Constraints on Neutrino Physics from DESI DR2 BAO and DR1 Full Shape
• GLIMPSE: An ultra-faint $\simeq$ 10$^{5}$ $M_{\odot}$ Pop III Galaxy Candidate and First Constraints on the Pop III UV Luminosity Function at $z\simeq6-7$
• Constraints on the Thomson optical depth to the CMB from the Lyman- alpha forest
• A New Constraint on the Optical Depth from the Reionization History Independent of CMB Large-Scale E-Mode Polarization
• Evidence for non-cold dark matter from DESI DR2 measurements
• Probing the ionizing photon output of galaxies near cosmic dawn with the patchy kSZ effect
• The evolution of protostars powered by dark matter annihilation. I. Fiducial model and first results
• The formation of supermassive black holes from Population III.1 seeds. IV. Self-regulated seeding from supermassive star ionizing feedback
• Percent-level timing of reionization: self-consistent, implicit-likelihood inference from XQR-30+ Ly$\alpha$ forest data
• The Evolution of Pop III.1 Protostars Powered by Dark Matter Annihilation. II. Dependence on WIMP Properties
• JWST Measurements of Neutral Hydrogen Fractions and Ionized Bubble Sizes at $z=7-12$ Obtained with Ly$\alpha$ Damping Wing Absorptions in 27 Bright Continuum Galaxies
• Bursty or heavy? The surprise of bright Population III systems in the Reionization era
• The Impact of Population III.1 Flash Reionization for CMB Polarization and Thomson Scattering Optical Depth
• The Origin of Supermassive Black Holes from Pop III.1 Seeds

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