Neutron Star as a Mirror for Gravitational Waves
  Gravitational wave (GW) has become one of the most active fields in physics
and astronomy since the first direct detection of GW event in 2015. As is well
known, multiple images of GW events are possible through the gravitational
lenses. Here, we propose a novel mirror imaging mechanism for GW events
different from the gravitational lens. In the literature, the superconductor
was predicted to be highly reflective mirror for GWs. It is well known that
neutron stars exhibit superconductivity and superfluidity. In this work, we
predict that there are two types of GW mirror imaging phenomena caused by the
neutron star located in Milky Way or the same host galaxy of GW source, which
might be detected within a life period of man (namely the time delay $\Delta t$
can be a few years to a few tens of years). It is expected to witness this
predicted GW mirror imaging phenomenon in the near future. In the long term,
the observations of this novel GW mirror imaging phenomenon might help us to
find numerous neutron stars unseen by other means, and learn more about the
complicated internal structures of neutron stars, as well as their equations of
state.
