The bosonic mother of fermionic D-branes

TL;DR

This paper explores the relationship between fermionic D-branes and the bosonic string compactified on E8 X SO(16), revealing how fermionic structures are constrained by the global SO(16) group and encoded in the universal covering.

Contribution

It extends the classification of fermionic D-branes in bosonic string theory, linking their properties to the global structure of SO(16) and refining the truncation procedure.

Findings

Fermionic D-branes are constrained by the global SO(16) structure.

Properties of fermionic D-branes are encoded in the universal covering.

The configuration space torus of the bosonic theory relates to fermionic D-branes.

Abstract

We extend the search for fermionic subspaces of the bosonic string compactified on E8 X SO(16) lattices to include all fermionic D-branes. This extension constraints the truncation procedure previously proposed and relates the fermionic strings, supersymmetric or not, to the global structure of the SO(16) group. The specific properties of all the fermionic D-branes are found to be encoded in its universal covering, whose maximal toroid defines the configuration space torus of their mother bosonic theory.