CP symmetry violation and matter antimatter asymmetry

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Main Question or Discussion Point

anyone know what research is being done in CP symmetry violations and Matter Antimatter Asymmetry currently?
 

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  • #2
malawi_glenn
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CP will be studied in e.g. LHCb
 
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The Nobel was given recently for CP-violation in the quark sector (the complex phase in the CKM-matrix). But that's not current research (it's just what's being acknowledged currently). Besides, this type of CP-violation is not enough to explain why there is more matter than antimatter.

The current popular theory is leptogenesis through CP-violating decay of inert heavy Majorana neutrinos in the early universe. This has the advantage of explaining in a natural way why neutrinos we see today are small (seesaw mechanism). Leptogenesis can be converted to Baryogenesis.
 
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baryogenesis coupled with cp symmetry violation, however, does offer an explanation for natures preference for matter ... but doesnt this also threaten the fact that the laws of physics are constant through time? also, if not cp symmetry, shoudnt there be some other symmetry that would govern particle formation?
 
  • #5
clem
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Put CP into the search for titles on arxiv.org or google, and stand back.
 
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baryogenesis coupled with cp symmetry violation, however, does offer an explanation for natures preference for matter ... but doesnt this also threaten the fact that the laws of physics are constant through time? also, if not cp symmetry, shoudnt there be some other symmetry that would govern particle formation?
While it's true that CP violation is equivalent to violation of time reversal symmetry (at least, as long as CPT is a good symmetry; and, that's a pretty good bet, since CPT symmetry is equivalent to Lorentz symmetry, as I understand it), this is quite different from time translation symmetry. There's no inconsistency with saying that allowed physical processes look different when run forwards than they do when run backwards, but that either way, they're the same at any time.
 

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