  The existence of stars with a large mass of 2 solar masses means that the
equation of state is stiff enough to provide high enough pressure at large
central densities. Previous work shows that such a stiff equation of state is
possible if the ground state has nucleons as its constituents. We find this to
be so in a chiral soliton ( skyrmion ) model for a composite nucleon which has
bound state quarks. The strong binding of the quarks in this composite nucleon
is plausibly the origin of the nucleon-nucleon hard core. In this model we find
a new state of superdense matter at high density which is a 'topological'cubic
crystal of overlapping composite nucleons that are solitons with relativistic
quark bound states. The quarks are frozen in a filled band of a unique state,
which not an eigenstate of spin or isospin but an eigenstate of spin plus
isospin, $ \vec S + \vec I = 0$. In this alternative model we find that all
neutron stars have no regular `free'quark matter. Neutron stars whose central
density crosses a threshold baryon density of approximately, $n_b \sim 1/fm^3
$, will become unstable and go through a decompression (sudden) density
discontinuity to conventional quark matter. Sequentially, this contraction of
the core of the star will soften the equation of state release a large amount
of gravitational potential energy which can give rise to a shock wave and
matter ejection. Since the merger of two neutron stars gives a compact state
whose mass is larger than the allowed maximum mass, this will be followed by a
jet and a short gamma ray burst while transiting into a black hole.
