Baryon Asymmetry

spidey
Its said that matter is more abundant than antimatter in observable universe and hence comes the baryon asymmetry...but why matter and antimatter should be equal in amount...which law governs this?

astrorob
Matter "condensed" out of radiation (think radiation era). We know two colliding photons will pair produce given the correct energy to produce a particle and its corresponding anti-particle - this would yield exactly similar quantities for antimatter and matter from the standard model.

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