Quote:
Originally Posted by bojan
That makes sense.
Redshift means we observe lower frequency of incoming light - however also everything else must slow down (supernova light curve decay rate). Does this slowing down correspond in amount to calculated time dilation? Or there is (much) more to the whole story?
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Time dilation relates to a broadening of the light curves (absolute magnitude vs time plot) and is related to redshift. The light curve of a supernova will be broader for a given redshift when compared to the light curve in the supernova's frame of reference at redshift z=0.
When a photon is emitted from the supernova it takes time t to reach us. The Universe metrically expands a certain amount during this interval. Each successive photon takes a longer time to reach us due to the expansion. The higher the redshift, the greater the expansion, the greater the time dilation.
Regards
Steven