Aspects of N=1 String Dynamics

TL;DR

This paper reviews key aspects of 4d N=1 heterotic string compactifications, focusing on singularities in moduli space that lead to novel physical phenomena like superpotentials and phase transitions affecting chiral generations.

Contribution

It provides a comprehensive overview of the physics at singularities in N=1 heterotic string models, highlighting new nonperturbative effects and phase transitions.

Findings

Nonperturbative superpotentials at singularities

Dynamical poles in low-energy couplings

Phase transitions altering chiral generation count

Abstract

We review several topics of interest in the study of 4d N=1 supersymmetric compactifications of the heterotic string. After a brief introduction to the construction of such models, our focus is on the novel physics which occurs at singularities in the moduli space of vacua. Among the phenomena we discuss are nonperturbative superpotentials, dynamical generation of poles in various low-energy couplings, and phase transitions which change the net number of chiral generations.