Abstract
The light curve of a type Ia supernova decays at a rate set by the -decay lifetimes of the and produced in the explosion. This makes such a light curve sensitive to the value of the Fermi constant at the time of the supernova. Using data from the CfA Supernova Archive, we measure the dependence of the light curve decay rate on redshift and place a bound on the time variation of of .
- Received 9 September 2010
DOI:https://doi.org/10.1103/PhysRevD.82.123002
© 2010 The American Physical Society