Stable Non-BPS States in F- theory

Details Stable Non-BPS States in F- theory Stable Non-BPS States in F- theory

1999-07-20

arxiv.org/abs/hep-th/9907164v2

JHEP 0003:036,2000

Physics

High Energy Physics

High Energy Physics - Theory

36 pages, LaTeX; added reference for section 3.1; added one equation in section 3.2.1

Scientific paper

10.1088/1126-6708/2000/03/036

F-theory on K3 admits non-BPS states that are represented as string junctions extending between 7-branes. We classify the non-BPS states which are guaranteed to be stable on account of charge conservation and the existence of a region of moduli space where the 7-branes supporting the junction can be isolated from the rest of the branes. We find three possibilities; the 7-brane configurations carrying: (i) the D_1 algebra representing a D7-brane near an orientifold O7-plane, whose stable non-BPS state was identified before, (ii) the exotic affine E_1 algebra, whose stable non-BPS state seems to be genuinely non-perturbative, and, (iii) the affine E_2 algebra representing a D7-brane near a pair of O7-planes. As a byproduct of our work we construct explicitly all 7-brane configurations that can be isolated in a K3. These include non-collapsible configurations of affine type.

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