The light curve of a type Ia supernova decays at a rate set by the beta-decay lifetimes of the 56N iand Co56 produced in the explosion. This makes such a light curve sensitive to the value of the Fermi constant GF 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 GF of |(dG_F/dt)/G_F| < 10-9 / y1.
Digital Object Identifier (DOI)
Published in Physical Review D, Volume 82, Issue 12, 2011.
© 2010 The American Physical Society
Ferrero, A., & Altschul, B. (2010). Limits on the time variation of the Fermi constantGFbased on type Ia supernova observations. Physical Review D, 82(12). https://doi.org/10.1103/physrevd.82.123002