<p>Matter and antimatter aren't perfectly symmetric, when following the "forward" direction of time. This is commonly called <a href="http://en.wikipedia.org/wiki/CP_violation" rel="nofollow">charge-parity violation</a>.
It's assumed, that this asymmetry caused an excess of matter in the early stages of the Universe after the Big Bang, annihilating almost all antimatter, and leaving behind matter.</p>

CC BY-SA 3.0
2014-10-06T17:06:44.817Z
So where are they now?  If you're still here this should be still eating away matter.
NeilRoy
CC BY-SA 3.0
2014-10-06T17:30:04.610Z
Thus far, no indication for anti-stars have been found, although detectors have looked for atomic anti-nuclei in cosmic rays. But it has been considered, that antimatter may form temporarily on some neutron stars. After contact with matter, antimatter is annihilated in a gamma flash, "eating" matter. Antimatter forms from high-energy gamma rays hitting matter. Due to the usual presence of matter this antimatter will be short-lived. But one cannot rule out, that it can escape sometimes, and live until an encounter with matter.
Gerald
CC BY-SA 3.0
2014-10-06T16:37:23.977Z
2014-10-06T16:37:23.977Z
Gerald
<p>This paper gives a possible explanation as to the missing antimatter, it suggests matter collides with antimatter in such a way the resultant ejected particles are real on-mass shell particles</p>
<p><a href="http://www.vixra.org/pdf/1811.0284v1.pdf" rel="nofollow noreferrer">Antimatter and the Big Bang</a>, J.C.O'Brien</p>

CC BY-SA 4.0
2020-11-19T22:37:38.217Z
2020-11-19T22:37:38.217Z
Bridget
<p>Well it is said that during the Big Bang, things were created in pairs: one matter and one anti-matter. I think its a part of the Big-Bang Theory.</p>

<p>It is also said that matter + anti-matter - Energy</p>

<p>Then shouldn't it be so that there would have been no matter or antimatter in existence now since all of them should have reacted to form pure Energy. I mean how were we created then?</p>

<p>And also where are all the antimatter gone now? Are they still reacting with us?</p>

<p>Thanks</p>

<big-bang-theory><early-universe><antimatter>
Matter and Antimatter Interaction in the early Universe
NeilRoy
# Matter and Antimatter Interaction in the early Universe

(Asked by: username_0 on 2014-10-06)

Well it is said that during the Big Bang, things were created in pairs: one matter and one anti-matter. I think its a part of the Big-Bang Theory.

It is also said that matter + anti-matter - Energy

Then shouldn't it be so that there would have been no matter or antimatter in existence now since all of them should have reacted to form pure Energy. I mean how were we created then?

And also where are all the antimatter gone now? Are they still reacting with us?

Thanks

**Tags:** big-bang-theory, early-universe, antimatter

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## 2 answers

### Answer by username_1 on 2014-10-06. Score: 2 | Accepted answer

Matter and antimatter aren't perfectly symmetric, when following the "forward" direction of time. This is commonly called [charge-parity violation](http://en.wikipedia.org/wiki/CP_violation).
It's assumed, that this asymmetry caused an excess of matter in the early stages of the Universe after the Big Bang, annihilating almost all antimatter, and leaving behind matter.

> **Comments:**
> **username_0**: So where are they now?  If you're still here this should be still eating away matter.  
> **username_1**: Thus far, no indication for anti-stars have been found, although detectors have looked for atomic anti-nuclei in cosmic rays. But it has been considered, that antimatter may form temporarily on some neutron stars. After contact with matter, antimatter is annihilated in a gamma flash, "eating" matter. Antimatter forms from high-energy gamma rays hitting matter. Due to the usual presence of matter this antimatter will be short-lived. But one cannot rule out, that it can escape sometimes, and live until an encounter with matter.  

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### Answer by username_2 on 2020-11-19. Score: 0

This paper gives a possible explanation as to the missing antimatter, it suggests matter collides with antimatter in such a way the resultant ejected particles are real on-mass shell particles

[Antimatter and the Big Bang](http://www.vixra.org/pdf/1811.0284v1.pdf), J.C.O'Brien


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