Two epochs of ESPRESSO spectra of quasar J052915.80-435152.0 yield a Lyman-alpha forest velocity drift of -1.25 +4.44/-4.46 m/s, consistent with zero, with model-based precision close to theoretical expectations.
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The ESPRESSO Redshift Drift Experiment I -- High-resolution spectra of the Lyman-$\alpha$ forest of QSO J052915.80-435152.0
Two epochs of ESPRESSO spectra of quasar J052915.80-435152.0 yield a Lyman-alpha forest velocity drift of -1.25 +4.44/-4.46 m/s, consistent with zero, with model-based precision close to theoretical expectations.