  We propose that spontaneous particle--anti-particle pair creations from the
discharged vacuum caused by the strong interactions in dense matter are major
sources of $\gamma$-ray bursts. Two neutron star collisions or black
hole-neutron star mergers at cosmological distance could produce a compact
object with its density exceeding the critical density for pair creations. The
emitted anti-particles annihilate with corresponding particles at the ambient
medium. This releases a large amount of energy. We discuss the spontaneous
$p\bar{p}$ pair creations within two neutron star collision and estimate the
exploded energy from $p\bar{p}$ annihilation processes. The total energy could
be around $10^{51} - 10^{53}$ erg depending on the impact parameter of
colliding neutron stars. This value fits well into the range of the initial
energy of the most energetic $\gamma$-ray bursts.
