On D-branes in Type 0 String Theory

TL;DR

This paper extends key insights from supersymmetric type II string theory to the non-supersymmetric Type 0 setting, focusing on D-branes and their intersections. It demonstrates that intersections of electric and magnetic Type 0 D-branes host chiral fermions and exhibit anomaly inflow described by a Wess-Zumino action, mirroring the Type II case. At an orbifold fixed point, it derives the massless spectrum for a system of $N$ electric and $N$ magnetic branes and provides a closed- and open-string description via twisted sectors and Chan-Paton actions, organizing the spectrum with a Type 0 quiver diagram. Moreover, the work argues for large $N$ conformal invariance in this setup, supported by a two-loop beta-function check. Together, these results reinforce the utility of Type 0 brane constructions for exploring non-supersymmetric gauge theories and string/gauge dualities.

Abstract

Using boundary states we derive the presence of (chiral) fermions on the intersection of type 0 D-branes. The corresponding anomalous couplings on the branes are then computed. Furthermore, we discuss systems of branes sitting at $A_n$ singularities. In particular, the massless spectrum on the branes is derived, and a boundary state description is given.

Figures (1)

• Figure 1: (a) Type II quiver diagram for the $\mathord{\!{}}_4$ orbifold. (b) Its type 0 counterpart: the links drawn with solid lines correspond to bosons, the other ones to fermions.