The Superstring-Inspired Generalizations of the Glashow-Weinberg-Salam Model

Abstract

The emergence of electroweak‐unification in the superstring scenario is reviewed. Limitations given by the known experimental data are discussed.

Does noncommutative geometry predict nonlinear Higgs mechanism?

“…The situation is far less satisfactory from the theoretical point of view: the model contains too many free parameters and the symmetry breaking sector is put ad hoc. String theory [1] may provide us with an explanation for the nature of (light) generations [2][3][4].…”

How many generations do superstring theories predict?

“…where bl,k are the Hodge-Betti numbers of the internal Calabi-Yau and x its Euler characteristic. In more general compactification, Ng is given by the index of the Dirac operator [2,9]. The value of Ng is usually set equal to the number of families in the GWS model, but this is not necessary.…”