On 6d "Gauge" Theories with Irrational Theta Angle
Abstract
A recent proposal for 6d "gauge" theories with rational theta angle is discussed. These theories were constructed from n_C coinciding (p,q) 5-branes of IIB in the limit of vanishing string constant. They have (1,1) supersymmetry and the low energy theory is 6d Yang-Mills with gauge group SU(n_C) and a rational theta angle theta_6/(2 pi)=f/q, where fp=1 (mod q). By changing the point of view, considering the (p,q) 5-branes to be D5-branes, the 6d theta angle is identified with a 10d theta angle. This point of view together with some assumptions suggests a generalization of the previous limit to arbitrary theta. This limit seems to define a decoupled 6d theory even though the 10d theory does not become free in general.
Cite
@article{arxiv.hep-th/9711017,
title = {On 6d "Gauge" Theories with Irrational Theta Angle},
author = {Barak Kol},
journal= {arXiv preprint arXiv:hep-th/9711017},
year = {2009}
}
Comments
8 pages, latex, 1 figure