Re: Basic Unification Question

Igor Khavkine <igor.kh@xxxxxxxxx> writes

>There are attempts to construct grand unified theories (GUTs) that
>unify the electroweak and strong forces. However, AFAIK, none of them
>have been completely successful. For example. the SU(5) GUT works quite
>well, except that it predicts the decay of the proton, which we do not
>see. I think it also only accounts for a neutrino of a single chirality
>(I don't remember whether it is a right- or left-handed one), which
>also gets screwed up if the neutrino has mass, which is what we seem to
>observe.

I imagine SU(5) was selected because it matches what we thought we saw,
that is a singly chiral massless neutrino.

Presumably if one were to do the same exercise today you would not
select/end up with SU(5) but something else.

This one might well have a proton decay very much less than SU(5) and
which may be consistent with current observations.

--
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