Kavli Affiliate: Chao-Lin Kuo
| First 5 Authors: A. R. Khalife, A. R. Khalife, , ,
| Summary:
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. From the latest SPT data alone, we
find the maximal fractional contribution of AEDE to the cosmic energy budget is
$f_rm EDE,<,0.12$ at $95,$% confidence level (CL), and the Hubble tension
between the SPT and SH0ES results is reduced to the $2.3,sigma$ level. When
combining the latest SPT, ACT, and $Planck$ datasets, we find $f_rm
EDE,<,0.091$ at $95,$% CL and the Hubble tension at the $3.3, sigma$
level. In contrast, adding DESI data to the CMB datasets results in mild
preference for AEDE and, in some cases, non-negligible reduction in the Hubble
tension. From SPT+DESI, we find $f_rm EDE,=,0.081^+0.037_-0.052$ at
$68,$% CL, and the Hubble tension reduces to $1.5,sigma$. From the
combination of DESI with all three CMB experiments, we get $f_rm EDE,=,
0.071^+0.035_-0.038$ at $68,$% CL and a weak preference for AEDE over
$Lambda$CDM. This data combination, in turn, reduces the Hubble tension to
$2.3, sigma$. We highlight that this shift in parameters when adding the DESI
dataset is a manifestation of the discrepancy currently present between DESI
and CMB experiments in the concordance model $Lambda$CDM.
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