On 6d "Gauge" Theories with Irrational Theta Angle

Details On 6d "Gauge" Theories with Irrational Theta Angle On 6d "Gauge" Theories with Irrational Theta Angle

1997-11-04

arxiv.org/abs/hep-th/9711017v1

JHEP 9911 (1999) 017

Physics

High Energy Physics

High Energy Physics - Theory

8 pages, latex, 1 figure

Scientific paper

10.1088/1126-6708/1999/11/017

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.

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