# Baryon asymmetry still going on

Baryon asymmetry

Why do we believe baryon asymmetry?

Why does matter-antimatter asymmetry only refer to baryon asymmetry?

How does inflation get rid of initial Baryon asymmetry (if any)?

None of these answer my question:

1. Is Baryon asymmetry over, or is it still going on in the observable universe? How do we know that no new matter is being created by pair creation and baryon asymmetry? Or is the amount of matter in the observable universe constant?

• @ÁrpádSzendrei No, not likely. Black holes are created overwhelmingly from baryonic matter, so if anything, they are destroying matter. And current black holes are far too cold to produce baryons- a solar mass black hole would take more than $10^{10}$ years to emit one proton's worth of energy as Hawking radiation. – Chris May 2 '18 at 20:02