Volume 485 - The European Physical Society Conference on High Energy Physics (EPS-HEP2025) - T01 Astroparticles, Gravitation and Cosmology
Cosmological constraints from ACT Data Release 6
A. La Posta
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Abstract
In March 2025, the Atacama Cosmology Telescope (ACT) released its last cosmological analysis, along with a new cosmic microwave background (CMB) dataset. The sixth data release (DR6), including data collected from 2017 to 2022, covers 40% of the sky at arcminute resolution providing the most precise maps of CMB temperature and polarization over a large sky area. Here I give an overview of the ACT DR6 analysis and describe its constraints on fundamental assumptions of the standard cosmological model and extensions to it, including constraints on particle physics.
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