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Limits on the Variation of Physical Constants Derived from Molecular Absorption Lines

Published online by Cambridge University Press:  25 May 2016

T. Wiklind  and
F. Combes
T. Wiklind
Affiliation:
Onsala Space Observatory, S-43992 Onsala, Sweden
F. Combes
Affiliation:
Observatoire de Paris 61 Av. de l'Observatoire, F-75014 Paris, France

Extract

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A potential diagnostic application of molecular rotational absorption lines at high redshift is to test the invariance of physical constants. This can be done by comparing the observed redshifted frequency of a molecular absorption line with redshifted lines from other types of transitions such as the 21cm hyperfine transition or electronic resonance transitions. In order to set stringent limits, it is necessary to achieve the greatest possible frequency resolution. This makes radio lines well suited for this purpose.

Type
III. Galaxy Formation and Evolution
Information
Symposium - International Astronomical Union , Volume 183: Cosmological Parameters and the Evolution of the Universe , 1999 , pp. 167
Copyright
Copyright © Kluwer 1999