# I Matter antimatter asymmetry

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1. Nov 14, 2016

### LightAmpzarus

I need someone to clarify where I have erred:
At the start of the universe, there should have been equal amounts of matter and Antimatter created, but we appear to live in a matter dominated universe.
If matter and antimatter mutually annihilate into energy, and energy and matter are equivalent, then why can't some of the the energy produced condense into matter, thus solving the problem?
I reckon my main mistake is in not knowing how energy coalesces into matter/antimatter (as well as not knowing about physics!)

2. Nov 14, 2016

### BvU

Hello LAzarus,

Problem is that there are some conservation laws that must hold when a concentration of energy produces particles: charge, energy/mass, momentum plus a few others. So energy $\ \rightarrow e^+e^+ \$ doesn't fly, whereas energy $\ \rightarrow e^+e^- \$ does.

3. Nov 14, 2016

### phinds

Yep, that's the consensus, BUT it is also the consensus that for reasons we don't understand it WASN'T, thus the existence of our universe made of matter.