"that elementary particles formed by strings?"

Elementary particles are described theoretically by the standard model a well developed and flexible quantum field theory, with the group structure of SU(3)xSU(2)xU(1).

The interest in string theories arises **because** this group structure can be embedded in the group behavior of the vibrations of a string. Automatically all the success of the standard model can be reproduced by string theories in their mathematical construction, assuming that the elementary particles are vibrations on a string,( of any type as long as they can carry the group structure).

In a sense , if strings had been studied before the experimental observation of SU(3)xSU(2)xU(1) , they could have predicted it.

It is not in the equations , but in the solutions, elementary particles are identified with the vibrations of the string of any type.

This post imported from StackExchange Physics at 2020-12-03 13:04 (UTC), posted by SE-user anna v