SPT-3G D1: Axion early dark energy with CMB experiments and DESI observations

Khalife, A. R., Balkenhol, L., Camphuis, E., Anderson, A. J. and Barry, P. S. 2026. SPT-3G D1: Axion early dark energy with CMB experiments and DESI observations. Physical Review D (particles, fields, gravitation, and cosmology) 113 (10) , 103546. 10.1103/8jjr-7hpb

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Abstract

We present the most up-to-date constraints on axion early dark energy (AEDE) from cosmic microwave background (CMB) and baryon acoustic oscillation (BAO) measurements. In particular, we assess the impact of data from ground-based CMB experiments, the South Pole Telescope (SPT) and the Atacama Cosmology Telescope (ACT)—both with and without Planck—on constraints on AEDE. We also highlight the impact that BAO information from the Dark Energy Spectroscopic Instrument (DESI) has on these constraints. From CMB data alone, we do not find statistically significant evidence for the presence of AEDE, and we find only moderate reduction in the Hubble tension...

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Physics and Astronomy
Additional Information:	License information from Publisher: LICENSE 1: URL: https://link.aps.org/licenses/aps-default-accepted-manuscript-license, Start Date: 2027-05-29
Publisher:	American Physical Society
ISSN:	2470-0010
Date of Acceptance:	10 April 2026
Last Modified:	01 Aug 2026 23:43
URI:	https://orca.cardiff.ac.uk/id/eprint/187527

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