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 γ-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
ppˉ​ pair creations within two neutron star collision and estimate the
exploded energy from ppˉ​ annihilation processes. The total energy could
be around 1051−1053 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 γ-ray bursts.Comment: 12 pages, Latex, 2 figures included; replaced by the revised version,
Int. J. Mod. Phys. E in pres