In my talk I will introduce the TianNu simulation, one of the world’s largest N-body simulations. It simulates the large scale structure of the Universe with cosmological neutrinos and discovers the ”differential neutrino condensation” effect. This effect attempts to use the difference between neutrino and cold dark matter densities in galaxy groups to measure the neutrino mass astronomically. In regions of the universe with different neutrino relative abundance (the local ratio of neutrino to cold dark matter density), halo properties are different and neutrino mass can be inferred. In ”neutrino-rich” regions, more neutrinos can be captured by massive halos compared with ”neutrino-poor” regions. This effect differentially skews the halo mass function and opens up the path to independent measurements of neutrino mass in current or future galaxy surveys.
These results are from our recent paper
https://www.nature.com/articles/s41550-017-0143
https://arxiv.org/abs/1609.08968
Dr.Yu got his Ph.D. in Astrophysics in Beijing Normal University. After that he became a joint postdoctoral fellow in Canadian Institute for Theoretical Astrophysics (CITA) in University of Toronto and Kavli Institute for Astronomy and Astrophysics (KIAA) in Peking University. Currently he is a joint postdoc fellow in TDLI and CITA.