Kavli Affiliate: Linhua Jiang
| First 5 Authors: Linhua Jiang, Shuqi Fu, Feige Wang, Sarah E. I. Bosman, Zheng Cai
| Summary:
We present constraints on the spacetime variation of the fine-structure
constant $alpha$ at redshifts $2.5le z<9.5$ using JWST emission-line
galaxies. The galaxy sample consists of 621 high-quality spectra with strong
and narrow [O III] $lambdalambda$4959,5007 doublet emission lines from 578
galaxies, including 232 spectra at $z>5$. The [O III] doublet lines are
arguably the best emission lines to probe the variation in $alpha$. We divide
our sample into six subsamples based on redshift and calculate the relative
variation $Deltaalpha/alpha$ for the individual subsamples. The calculated
$Deltaalpha/alpha$ values are consistent with zero within $1sigma$ at all
redshifts, suggesting no time variation in $alpha$ above a level of $(1-2)
times10^{-4}$ ($1sigma$) in the past 13.2 billion years. When the whole
sample is combined, the constraint is improved to be $Deltaalpha/alpha =
(0.2pm0.7) times10^{-4}$. We further test the spatial variation in $alpha$
using four subsamples of galaxies in four different directions on the sky. The
measured $Deltaalpha/alpha$ values are consistent with zero at a $1sigma$
level of $sim 2times10^{-4}$. While the constraints in this work are not as
stringent as those from lower-redshift quasar absorption lines in previous
studies, this work uses an independent tracer and provides the first
constraints on $Deltaalpha/alpha$ at the highest redshifts. With the growing
number of emission-line galaxies from JWST, we expect to achieve stronger
constraints in the future.
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