In particle, antimatter is a material composed of antiparticles, which have the same mass as particles of ordinary matter, but opposite charges lepton number and baryon number. Collisions between particles and antiparticles lead to the annihilation of both, giving rise to variable proportions of intense photons(gamma rays) neutrinos and less massive particle–antiparticle pairs. The total consequence of annihilation is a release of energy available for work, proportional to the total matter and antimatter mass, in accord with the mass energy equivalence equation, E = mc2
antimatter had opposite charge, opposite spin opposite configuration of the sub particles that made it up.antimatter had equal mass as matter.
when universe started expanding it was so dense at the starting point that antimatter fall into the singularity and leftover matter was thrown in the infinity. antimatter that fell in the density of space time appears as in another parallel universe. matter that was thrown became a part of this expanding universe.
But not all antimatter got sucked in that dense soup of distorted space time. with passage of few seconds universe becomes less dense and antimatter no more fall into conical singularity and annihilated with matter formed after the big bang. but still after this annihilation for every billion of antiparticle there was billion+1 particle that was a big difference on a large scale as big as our cosmos and was really important for the formation of expanding universe. this was because most of matter was conserved as its proportionality with antimatter was much more.
although big bang created symmetry by creating equal amount of matter and antimatter but due to infinite gravitational force just after the big bang few proportion of antimatter was absorbed and not all antimatter was sucked in because that infinite amount of gravity tends to happen for few microseconds that was not sufficient to capture all of the virtual particles.
PHYSICS SAGA 