4-string Junction and Its Network

Details 4-string Junction and Its Network 4-string Junction and Its Network

1998-07-19

arxiv.org/abs/hep-th/9807139v1

Phys.Lett.B443:167-176,1998

Physics

High Energy Physics

High Energy Physics - Theory

15 pages, Latex

Scientific paper

10.1016/S0370-2693(98)01314-8

We study a BPS configuration in which four strings (of different type) meet at a point in $N = 2, D = 8$ supergravity, i.e., the low energy effective theory of $T^2$-compactified type II string theory. We demonstrate that the charge conservation of the four strings implies the vanishing of the net force (due to the tensions of various strings) at the junction and vice versa, using the tension formula for $SL(3, Z)$ strings obtained recently by the present authors. We then show that a general 4-string junction preserves 1/8 of the spacetime supersymmetries. Using 4-string junctions as building blocks, we construct a string network which also preserves 1/8 of the spacetime supersymmetries.

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