Well I think I have solved the matter-antimatter asymmetry.But this includes that the universe is not expanding , it is just being stretched . I will explain everything :
In the beginning space-time was so curved that it existed in the size of a sugar cube.All the energy of the universe was stored inside that cube of sugar.Then dark energy took over and started to stretch the universe.Space-time started becoming more flat , and it "seemed" to be expanding , but in reality it was just stretched.During the era of the first particle - antiparticle pairs the universe was still very curved at some points of space-time.
This acted like an event horizon . Just like the event horizon , when an particle-antiparticle pair is created near the event horizon , the gravitational pull of the black hole doesn't let it escape , while the other escapes and becomes a real particle .
According to quantum mechanics the chance of a particle to be generated just outside the event horizon and its pair to be generated inside the black hole is equal to the chance of a particle to be generated inside the black hole and its pair to be generated just outside the event horizon.
From all the particle-antiparticle pairs more particles became real particles than antiparticles so in the end matter came victorious against antimatter . This also means that somewhere in the universe there is an area full with anti-particles! This area is not reached because I guess dark energy hasn't stretched space-time enough!