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- W4301204920 abstract "We analyze three aspects of N=1 heterotic string compactifications on elliptically fibered Calabi-Yau threefolds: stability of vector bundles, five-brane instanton transitions and chiral matter. First we show that relative Fourier-Mukai transformation preserves absolute stability. This is relevant for vector bundles whose spectral cover is reducible. Then we derive an explicit formula for the number of moduli which occur in (vertical) five-brane instanton transitions provided a certain vanishing argument applies. Such transitions increase the holonomy of the heterotic vector bundle and cause gauge changing phase transitions. In an M-theory description the transitions are associated with collisions of bulk five-branes with one of the boundary fixed planes. In F-theory they correspond to three-brane instanton transitions. Our derivation relies on an index computation with data localized along the curve which is related to the existence of chiral matter in this class of heterotic vacua. Finally, we show how to compute the number of chiral matter multiplets for this class of vacua allowing to discuss the associated Yukawa couplings." @default.
- W4301204920 created "2022-10-05" @default.
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- W4301204920 date "2003-05-14" @default.
- W4301204920 modified "2023-09-27" @default.
- W4301204920 title "Comments on N=1 Heterotic String Vacua" @default.
- W4301204920 doi "https://doi.org/10.48550/arxiv.hep-th/0305123" @default.
- W4301204920 hasPublicationYear "2003" @default.
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