Document Type
Article
Publication Date
5-6-2024
Published In
Physical Review D
Abstract
The south pole telescope (SPT) SPT-3G 2018 cosmic microwave background (CMB) data set (temperature and polarization) is used to place constraints on an axionlike model of early dark energy (EDE). These data do not favor axionlike EDE and place an upper limit on the maximum fraction of the total energy density πEDE < 0.172 (at the 95% confidence level, C.L.). This is in contrast with Atacama Cosmology telescopeβs (ACT) fourth data release (DR4) which gives πEDE = 0.15β’0 +0.050/-0.078. When combining CMB measurements with measurements of the baryon acoustic oscillations and luminosity distance to type Ia supernovae, we show that the tension with the Sβ’π»β β‘ES measurement of the Hubble parameter goes up from 2.6β’π with πβ’πβ’πβ’πβ’πβ’π to 2.9β’π with πβ’πβ’πβ’πβ’πβ’π+SPTβ3β’G 2018. The additional inclusion of ACT DR4 data leads to a reduction of the tension to 1.6β’π, but the discrepancy between ACT DR4 and πβ’πβ’πβ’πβ’πβ’π+SPTβ3β’G 2018 casts some doubt on the statistical consistency of this joint analysis. The importance of improved measurements of the CMB at both intermediate and small scales (in particular, the shape of the damping tail) as well as the interplay between temperature and polarization measurements in constraining EDE are discussed. Upcoming ground-based measurements of the CMB will play a crucial role in determining whether EDE remains a viable model to address the Hubble tension.
Recommended Citation
Tristan L. Smith and V. Poulin.
(2024).
"Current Small-Scale CMB Constraints To Axionlike Early Dark Energy".
Physical Review D.
Volume 109,
DOI: 10.1103/PhysRevD.109.103506
https://works.swarthmore.edu/fac-physics/552
Comments
This work is freely available courtesy of the American Physical Society.