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We have compared the risetime for samples of nearby and high-redshift type Iasupernovae (SNe Ia).  The fiducial risetime of the nearby SNe Ia is 2.5+/-0.4 days longer than theproemial risetime determined by Goldhaber (1998a,b) for high-redshift SNe  Ia from the Supernova Cosmology Project.  The statistical likelihood that the two samples have different fiducialrisetimes is high (5.8 sigma) and indicates possible evolution between thesamples of SNe Ia. We consider the likely effects of several sources ofsystematic error, but none of these resolves the difference in the risetimes.  Currently, we cannot directly determine the impact of the apparent evolutionon previous determinations of cosmological parameters.Comment: Accepted by the Astronomical Journal, 11 pages, 5 figure

Is there an Indication of Evolution of Type [CLC]Ia[/CLC] Supernovae from their Rise Times?