Asymmetric Gepner Models

In the same spirit as heterotic weight lifting, B-L lifting is a way of replacing the superfluous and ubiquitous U(1)B−L with something else with the same modular properties, but different conformal weights and ground state dimensions. This method works in principle for all variants of (2, 2) constructions, such as orbifolds, Calabi-Yau manifolds, free bosons and fermions and Gepner models, since it only modifies the universal SO(10) × E8 part of the CFT. However, it can only yield chiral spectra if the “internal ” sector of the theory provides a simple current of order 5. Here we apply this new method to Gepner models. Including exceptional invariants, 86 of them have the required order 5 simple current, and 69 of these yield chiral spectra. Three family spectra occur abundantly. 1This paper is dedicated to the memory of Max Kreuzer. 2Also known as B. Gato 1 a