- #36
PAllen
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ok, I agree this argument by analogy has flaws.Chalnoth said:Electrons are the lightest charged particle. So they can't decay unless there is non-conservation of charge, which we have no reason to believe.
Chalnoth said:I would say requiring baryogenesis from a hot dense symmetric state is ironclad at present given the evidence. And I have a really, really hard time buying that you can produce a theory which explains baryogenesis from such a state without proton decay that also respects CPT symmetry.
Still waiting for the tight argument from CPT. Independent of whether you judge evidence for " a hot dense symmetric origin" ironclad (you) or highly likely (me), it is still another assumption. Let me rephrase what seems the minimal chain of reasoning leading to proton decay:
1) There is baryon asymmetry in the current universe.
2) At some earlier time there was no baryon asymmetry. Therefore baryon number is not exactly conserved.
3) The principle that a decay that is not prohibited, must occur, is an ironclad principle.
4) Without baryon conservation, nothing prevents the decay of a proton to positron and neutrino. [edit: corrected to neutrino]
To me:
(1) is extremely likely, based on observation + theory, but is not 100%.
(2) is very likely, not quite as strongly as (1)
(3) is very plausible, but what I would like to see is a tight argument that this is required by CPT.
(4) Given (1)-(3), this is ironclad.
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