The great Matter-Antimatter Imbalance

[Gluonium]

Hi all, i am buckling down and trying to finish this report on this subject. The only problem is that i am having trouble finding theories to explain this. Do Supersymmetry, String Theory, or Superstring Theory have a stance on this imbalance? Does M-Theory?

Or are there real, researched theories out there specifically directed at this problem?

Thanks everyone for your help! :D

 

[mathman]

There are qualitative explanations, based on parity violation. However, the quantitative aspects have yet to worked out.

 

[Rade]

There may not be an imbalance. The antimatter may be present within the matter as a quantum superposition, we just do not "observe" it until we look for it--not a "theory" but a hypothesis. See this paper:
http://www.geocities.com/ptep_online/PP-04-03.PDF
What is presented here is a hypothesis open to falsification--such is the way of science. Do not "conclude" that imbalance of matter and antimatter exists as a first premise--you may not be correct.

 

[arivero]

Note that the Standard Model already has CP, thus T, violating parameters.

 

[ahrkron]

Google for "CP violation", "CKM matrix", "Sin2beta analysis". The bottomline: there is an imbalance. One source of it has been modeled through the way quarks "mix". However, the amount of imbalance due to that mehcanism seems insufficient to explain the asymmettry that can be inferred from the amount of matter in the universe.

There was an important result obtained recently that is related to this. Google for "Bs mixing". Some non-technical articles may be useful.

 

[ZapperZ]

There's another thread in Cosmology doing the same thing.

https://www.physicsforums.com/showthread.php?t=116119

The latest result that ahrkron is referring to is the result out of CDF, a review of which can be found here:

http://physicsweb.org/articles/news/10/4/6/1

Zz.

 

[arivero]

Google for "CP violation", "CKM matrix", "Sin2beta analysis". The bottomline: there is an imbalance. One source of it has been modeled through the way quarks "mix". However, the amount of imbalance due to that mehcanism seems insufficient to explain the asymmettry that can be inferred from the amount of matter in the universe.

Yes, thinking about it, the title of this thread is good enough. We can speak of "the minor Matter-Antimatter Imbalance", from the known CP violation, or of "The great Matter-Antimatter Imbalance", unknown.

 

[Gluonium]

Thanks guys, ill look into it.

I have read over and over that CP violation accounts for SOME of the imbalance, but not all of it. Thanks for the help, keep it coming! :D

 

[ray b]

just triped over this link about
"While it has been known that the neutral B_s meson (b-antiquark and s-quark) oscillates between matter and antimatter, it has proven difficult to pin down the details. The current theory of matter suggests that B_s mesons oscillate much faster than B_d mesons (anti-bottom quark plus a down quark); consequently, their oscillations are very difficult to detect. "

http://www.canada.com/edmontonjournal/news/story.html?id=2d2333fc-1e2a-4763-acb1-b265c2a0860b&k=14299

and then found this

http://www.fnal.gov/pub/presspass/press_releases/DZeroB_s.html

and

http://www.fnal.gov/pub/presspass/press_releases/CDF_04-11-06.html

I had no idea matter could become anti-matter and vice-verse
let alone that quickly

so is anti-matter stable or does it become something else
much like a free neutron with a short half-life

 

[ahrkron]

By itself, an antimatter particle will almost always be as stable as its matter counterpart (the deviations to this statement have been found to be small).

On the other hand, in a matter-dominated universe, antimatter particles will annihilate with matter particles quite soon, but that is not because of them being unstable.