Limits on the Variability of Physical Constants

Details Limits on the Variability of Physical Constants Limits on the Variability of Physical Constants

1997-09-24

arxiv.org/abs/astro-ph/9709227v1

Astronomy and Astrophysics

Astrophysics

To appear in: Structure and Evolution of the IGM from QSO Absorption Line Systems, IAP Colloquium, eds. P. Petitjean and S. Ch

Scientific paper

We have compared the frequency of high-redshift Hydrogen HI 21 cm absorption
with that of associated molecular absorption in two quasars to place new (1
sigma) upper limits on any variation in y = g_p.alpha^2 (where alpha is the
fine structure constant and g_p is the proton g-factor) of |Delta(y)/y| <
5.10^{-6} at redshifts z=0.25 and z=0.68.

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