  We discuss possible implications of the recent detection by the LIGO and
VIRGO collaboration of the gravitational-wave event GW170817, the signal of
which is consistent with predictions in general relativity on the merging of
neutron stars. A near-simultaneous and spatially correlated observation of a
gamma-ray burst, the GRB 170817A signal, was achieved independently by the
Fermi Gamma-ray Burst Monitor, and by the Anti-coincidence Shield for the
Spectrometer of the International Gamma-Ray Astrophysics Laboratory. Motivated
by this near temporal and spatial concomitance of events, which can occur by
chance only with the probability $5.0 \, \times \, 10^{-8}$, we speculate on
the possibility that new dark stars signals could be detected from the
LIGO/VIRGO detectors. This proposal, which aims at providing a test for some
models of dark matter, relies on the recent achievement of detecting, for
visible ordinary matter, the merging of neutron stars both in the gravitational
and the electromagnetic channel. A lack of correlation between the two expected
signals would suggest a deviation from the properties of ordinary matter.
Specifically, we focus on models of invisible dark matter, and in particular we
study the case of mirror dark matter, within the framework of which a large
amount of mirror neutron stars are naturally envisaged to occupy our dark
matter halo. The observation of an electromagnetically hidden event inside the
dark matter halo of our galaxy should provide a hint of new physics. There
would be indeed no satisfactorily complete explanation accounting for the lack
of electromagnetic signal, if only standard neutron star merging were
considered to describe events that happen so close to us.
