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Measuring sigma_8 with Weak Lensing of Supernovae

by Miguel Quartin (Univ. Federal do Rio de Janeiro, UFRJ, Brasil)

Jan 16, 2014 from 02:00 PM to 04:00 PM

Where Seminars' room, floor -1, via Ranzani 1

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Abstract:

Soon the number of type Ia supernovae (SNe) measurements should surpass 10^5. Understanding weak lensing effects in these objects will then be more important than ever. Although SNe lensing is usually seen as a source of systematic noise in this talk I will show how this noise can be in fact turned into signal. I will thus first describe how we were able to accurately model the lensing effects. I will then use these fits to show that the SNe Hubble diagram dispersion is basically modulated by Omega_m0 and sigma_8. I will argue that the modelling of this dispersion allows for an independent measurement also of sigma_8 with supernova data. I will finally show some results using real data.

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