| Number | R7-5 / IPMU/ILANCE/ICRR joint seminar |
| Date | Tue, Nov 18, 2025 15:00- |
| Place | ICRR 6F Large seminar room Zoom: https://u-tokyo-ac-jp.zoom.us/j/85601429361?pwd=QPiwzBsH4AfOPgpeqFeRNgxA5Z3KcF.1 |
| Speaker | Federico Urban (CEICO, Institute of Physics of the Czech Academy of Sciences) |
| Title | “Tomographic constraints on the high-energy cosmic neutrino emission rate” |
| Abstract | Despite growing efforts to find the sources of high-energy neutrinos measured by IceCube, the type and emission properties of cosmic neutrino sources remain unknown. In this work we show how it is possible to constrain (and, in the future, measure) the neutrino emissivity of extragalactic sources thanks to the cross-correlation of cosmic neutrinos with the large-scale structure. We use the IceCube 10-year dataset and tomographic maps of the galaxy overdensity to place constraints on the high-energy neutrino emissivity out to redshift z~3, using several models describing the evolution of neutrino emissivity with redshift. While we do not find any significant correlation, we find tentative evidence of one, corresponding to a 1.9 sigma deviation with respect to a model with zero signal. We can thus, for the first time, obtain upper bounds on the astrophysical high-energy neutrino emission rate as a function of redshift for different source models. |
