Observations of Type II-P supernovae (SNe) are closing the gap with
SNe Ia for cosmological
measurements. While SNe Ia are more luminous, SNe II-P are more numerous
at high z, and easier to model ab initio. While current SN Ia surveys have
reached the limit of systematic uncertainties, SNe II-P offer a
different lever arm.
This suggests that II-P's may become a prominent tool in the
TMT/LSST/JWST era, if proper foundations are laid in time.
I will describe our results to date, and our current efforts to
further test and apply these methods.
Though we see this work as a pathfinder, this project can supply
an independent, unequivocal measure of cosmic acceleration.
If time permits I will also discuss our latest results on the
measurement of the rate of SNe Ia at high redshift,
as a probe of progenitor channels.