منابع مشابه
Orientifolds, Branes, and Duality of 4D Gauge Theories
Recently, a D–brane construction in type IIA string theory was shown to yield the electric/magnetic duality of four dimensional N=1 supersymmetric U(Nc) gauge theories with Nf flavours of quark. We present here an extension of that construction which yields the electric/magnetic duality for the SO(Nc) and USp(Nc) gauge theories with Nf quarks, by adding an orientifold plane which is consistent ...
متن کاملbranes , Orientifolds and K - theory
The complete D-brane spectrum in Z Z 2 orientifolds is computed. Stable non-BPS D-branes with both integral and torsion charges are found. The relation to K-theory is discussed and a new K-theory relevant to orientifolds is suggested.
متن کاملIntersecting M2– and M5–branes
If an M2–brane intersects an M5–brane the canonical Wess–Zumino action is plagued by a Dirac–anomaly, i.e. a non–integer change of the action under a change of Dirac–brane. We show that this anomaly can be eliminated at the expense of a gravitational anomaly supported on the intersection manifold. Eventually we check that the last one is cancelled by the anomaly produced by the fermions present...
متن کاملM2-branes stretching between M5-branes
A generalization of Nahm’s equation has been recently conjectured by Basu and Harvey to be the BPS condition describing the bound state of a stack of M2branes ending on an M5-brane. In this note exact solutions are presented for the proposed BPS equation – which is from the point of view of the M2-brane world-volume dynamics – with boundary conditions appropriate for M2-branes stretching betwee...
متن کاملOrientifolds with Intersecting D-branes
Intersecting branes provide a framework to engineer semi-realistic gauge interactions with massless fermion spectra identical to those of the Standard Model or grand unified theories. We describe the most general setting where these models can preserve supersymmetry in the context of perturbative string theory. It is defined by Calabi-Yau and K3 compactifications of type II strings supplemented...
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2016
ISSN: 1029-8479
DOI: 10.1007/jhep12(2016)148