I present two methods which allows measurement of cosmic structure through the dispersion of supernova in the Hubble diagram. They are based on weak-lensing and peculiar velocity effects on the supernovae. Such signal can be used as a novel measurement of growth of structure, independently from traditional methods. I then show that current data already allows a consistency check and the first measurement of both sigma_8 and gamma (the modified gravity growth-rate index) using SN magnitudes alone. Although these first results are not very precise, future surveys will make these new methods competitive and valuable.

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