arXiv:hep-th/9907164hep-th
Stable Non-BPS States in F- theory
Abstract
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.
I want to put a hyperlink to Eq. (4.4) of http://arxiv.org/abs/hep-th/9907164 What is the right format? How can it even in principle work? If I click on the link: http://arxiv.org/abs/hep-th/9907164/Eq_4_4 what is supposed to happen?
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Is http://arxiv.org/pdf/hep-th/9907164v2.pdf#page=30 a reasonable approximation? It works in Chrome and should work with the Adobe plugin, but doesn't work in Safari. I don't know if PDF has finer scale references than page.
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