APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Kingman Cheung (National Tsing Hua University)
Title: Majoron dark matter (decaying) and Structure Formation
Date (JST): Fri, Jun 28, 2019, 13:30 - 14:30
Place: Seminar Room A
Related File: 2356.pdf
Abstract: The decaying warm dark matter (DWDM) scenario is well-motivated, emerging in a broad class of particle physics theories where neutrino masses arise from the spontaneous breaking of a continuous global lepton number symmetry. The majoron arises as a Nambu-Goldstone boson, The majoron necessarily decays to neutrinos, with an amplitude proportional to their tiny mass, which typically gives it cosmologically long lifetimes. Using N-body simulations we show that our DWDM picture leads to a viable alternative to the ΛCDM scenario, with predictions that can differ substantially on small scales.