# What if there was no baryon-antibaryon asymmetry in our universe?

We know that the universe goes through different evolutionary phases: radiation, matter and later dark energy epoch.

What would happen if there was no baryon-antibaryon asymmetry? How would the evolutionary phases change? Would their period lengths be changed and why?

There are extensions of the model that break the symmetry at baryogenesis time. This happens at $$10^{-11}$$ in the plot. , by the time of quark confinement which will decide the number of baryons and antibaryons.