D-branes in N=2 Strings

TL;DR

This paper explores the properties, geometry, and effective theories of D-branes in N=2 string theories, analyzing their scattering amplitudes, decoupling behavior, and potential dualities.

Contribution

It provides a detailed analysis of D-branes in N=2 strings, including their geometry, scattering amplitudes, effective worldvolume theories, and gravity backgrounds, highlighting differences between A-type and B-type branes.

Findings

B-type D-branes decouple from the bulk except space-filling ones

A-type D-branes are inconsistent

Effective theories are reductions of self-dual Yang-Mills

Abstract

We study various aspects of D-branes in the two families of closed N=2 strings denoted by \alpha and \beta in hep-th/0211147. We consider two types of N=2 boundary conditions, A-type and B-type. We analyse the D-branes geometry. We compute open and closed string scattering amplitudes in the presence of the D-branes and discuss the results. We find that, except the space filling D-branes, the B-type D-branes decouple from the bulk. The A-type D-branes exhibit inconsistency. We construct the D-branes effective worldvolume theories. They are given by a dimensional reduction of self-dual Yang-Mills theory in four dimensions. We construct the D-branes gravity backgrounds. Finally, we discuss possible N=2 open/closed string dualities.