Ammonia as a Tracer of Fundamental Constants

Details Ammonia as a Tracer of Fundamental Constants Ammonia as a Tracer of Fundamental Constants

2010-04-06

arxiv.org/abs/1004.0912v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

3 pages, Contribution to the 12th Marcel Grossmann Meeting (MG12) in Paris, 2009 July 12-18,Parallel session EG2 (Variation of

Scientific paper

Observing inversion lines of ammonia (NH3), complemented by rotational lines of NH3 and other molecular species, provides stringent constraints on potential variations of the proton-to-electron mass ratio. While a limit of one part per million is derived for a lookback time of 7 billion years, nearby dark clouds might show a statistically significant variation of order 20-30 parts per billion, possibly being related to chameleon fields. The detection of radio-loud quasars with strong molecular absorption lines at redshifts z > 1 as well as the identification of a larger sample of nearby dark clouds with exceptionally narrow lines (<0.2 km/s) would be essential to improve present limits and to put the acquired results onto a firmer statistical basis.

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