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Methods for Constraining Fine Structure Constant Evolution with OH Microwave Transitions
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Methods for Constraining Fine Structure Constant Evolution with OH Microwave Transitions
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We investigate the constraints that OH microwave transitions in megamasers and molecular absorbers at cosmological distances may place on the evolution of the fine structure constant alpha=e^2/(hbar c). The centimeter OH transitions are a combination of hyperfine splitting and lambda-doubling that can constrain the cosmic evolution of alpha from a single species, avoiding systematic errors in alpha measurements from multiple species which may have relative velocity offsets. The most promising method compares the 18 and 6 cm OH lines, includes a calibration of systematic errors, and offers multiple determinations of alpha in a single object. Comparisons of OH lines to the HI 21 cm line and CO rotational transitions also show promise.
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Cited by 1 Pith paper
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The FAST HI 21-cm Absorption Blind Survey. III. OH Absorption Search in the 21-cm Absorber Sample and Continued HI Absorption Search
A blind FAST survey of 41 HI absorbers re-detected the known OH absorber PKS 1413+135, found no new OH, and set [OH]/[HI] upper limits near 1e-8.
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