[talanum1 (OP)]

I think that a model for particle structure should explain why there is neutrinos. Why doesn't string theory explain it?

[Kryptid]

Do you have a source saying that it can't?

[talanum1 (OP)]

Do you have a source saying that it can't?

No, but they would have made a fuss about it if it could.

[Kryptid]

No, but they would have made a fuss about it if it could.

Why? Why would that be any more significant than it explaining any other particle?

[evan_au]

Why doesn't String Theory explain the Existence of Neutrinos?

The same reason why string theory can't explain any of the "particle zoo" we see in the LHC - string theory is not a single theory, but a framework containing about 10⁵⁰⁰ different theories, and we haven't yet discovered the "right" one that describes our universe
- although I have heard some theorists suggest that they are getting closer
- One problem with string theory is that the behaviour changes radically with the way you set about 10 parameters, and there is no obvious way to determine the "right" value of these parameters.
- Another problem with string theory is that we can't tell it it is "correct" or even "useful" until it starts making testable predictions about our universe. We are not there yet.

As I understand it, the one particle that pops naturally out of string theory is the graviton - ironically, a particle we have no chance of detecting with our current technology.

https://en.wikipedia.org/wiki/String_theory#Number_of_solutions