A simple varying-speed-of-light hypothesis is enough for explaining   high-redshift supernovae data
  The hypothesis that the speed of light decreases by nearly 2 cm per sec and per year is discussed within the frame of a simple phenomenological model. It is shown that this hypothesis can provide an alternative explanation for the redshift-distance relationship of type Ia supernovae, which is nowadays given in terms of a new form of (dark) energy of unknown origin. 
Yves-Henri Sanejouand