Multi-messanger astrophysics has grown since the discovery of
neutrinos from SN 1987A.
Recently, a big step forward in this field has occurred by the first
detection of gravitational waves, GW150914
and the first simultaneous detection of gravitational-wave and
electromagnetic signals from a binary
neutron star merger GW170817. In this talk, I'll give an overview of what
we learned from the multi-messanger
signals of GW170817 including the neutron star equation of state, r-process
nucleosynthesis, as well as
the Hubble constant. I'll also talk about a recent progress on the
modelings of r-process kilonovae. Finally,
I'll discuss neutrino shock acceleration in core collapse,
which efficiently produces mu and tau neutrinos
at 100 MeV. Detecting such signals will bring us valuable information about
the nature of core collapse.
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