Time: 2PM, October 31, 2017
Venue: R521, IoA, 2nd General Building 綜二館R521
Speaker: Prof. Toshifumi Futamase (Kyoto Sangyo University)
Title: Constraints on neutrino masses from the lensing dispersion of Type Ia supernovae
Abstract:
We investigate how accurately the total mass of neutrinos is constrained from the magnitude dispersion of SNe Ia due to the effects of gravitational lensing. With a fitting formula for the nonlinear matter power spectrum taking account of the effects of massive neutrinos, we find that in our model it is possible to obtain the upper limit m ≃ 1.0 [eV] for future optical imaging surveys with the Wide-Field InfraRed Survey Telescope and Large Synoptic Survey Telescope. We discuss how far we need to observe SNe Ia and to what extent we have to reduce the magnitude error except for lensing in order to realize the current tightest limit m < 0.2 [eV], and mention the possibility to use gravitational waves from coalescing binaries as a promising method for this purpose.
