| Speaker: |
Liang Tan (Tsung-Dao Lee Institute) |
| Title: |
Probe Neutrino and light DM with Cosmic Gravitational focusing |
| Date (JST): |
Fri, Feb 27, 2026, 13:30 - 15:00 |
| Place: |
Seminar Room A |
| Abstract: |
The cosmic gravitational focusing (CGF) of relic provides an independent measurement of the cosmic relics such as cosmic neutrinos and light dark matter (DM). This effect eventually produces a dipole density distribution that can affect the galaxy formation and thus can be reconstructed with galaxy surveys such as DESI. For cosmic neutrinos, the CGF have a mass forth power dependence which can help determine neutrino mass ordering. Also, for light DM, the mass dependence scales as second power. The CGF is most sensitive in the region 0.1-100 eV, where it offers a sensitivity two orders of magnitude stronger than the existing constraints from the Lyman-$\alpha$ and $\Delta N_{\rm eff}$.
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