Speaker
Ayuki Kamada
(IBS-CTPU)
Description
Our current understanding of the large-scale structure of the Universe is based on the cold dark matter model.
Observed small-scale (sub-galactic) matter distribution, on the other hand, appears to challenge this standard paradigm.
Self-interaction between dark matter particles reconciles small-scale issues by flattening the dark matter density profile inside halos.
I will present a particle physics model of self-interacting dark matter with the cross section diminishing with increasing velocity, which maintains the success of the cold dark matter model above galactic scales.
The model is based on a gauged Lmu-Ltau extension of the standard model, where the mu and tau leptons and neutrinos in addition to dark matter particles couple to a new gauge boson.
Interestingly, it ameliorates the discrepancy of the measured muon g-2 with the standard model prediction and the small-scale issues in the structure formation at the same time.
I will demonstrate how the neutrino physics experiments, such as Borexino (solar neutrino experiment), IceCube (high-energy neutrino observatory), and Planck (cosmological measurement of effective number of neutrino degrees of freedom), constrain its parameter space.
Primary author
Ayuki Kamada
(IBS-CTPU)
Co-authors
Hai-bo Yu
(University of California, Riverside)
Keisuke Yanagi
(University of Tokyo)
Kunio Kaneta
(University of Minnesota)
