The CO A-X System for Constraining Cosmological Drift of the Proton-Electron Mass Ratio

E. J. Salumbides, M. L. Niu, J. Bagdonaite +4

The ${\text{A}}^1\Pi -{\text{X}}^1{\Sigma }^{+}$ band system of carbon monoxide, which has been detected in six highly redshifted galaxies ($z=1.6-2.7$), is identified as a novel probe method t…