Constraints on changes in fundamental constants from a cosmologically distant OH absorber/emitter

N. Kanekar, C. L. Carilli, G. I. Langston +7

We have detected the four 18cm OH lines from the $z\sim 0.765$ gravitational lens toward PMN J0134-0931. The 1612 and 1720 MHz lines are in conjugate absorption and emission, prov…