Decompactifications and massless D-branes in hybrid models

Article

Abstract

A method of determining the mass spectrum of BPS D-branes in any phase limit of a gauged linear sigma model is introduced. A ring associated to monodromy is defined and one considers K-theory to be a module over this ring. A simple but interesting class of hybrid models with Landau-Ginzburg fibres over \( {\mathbb{P}^n} \) are analyzed using special Kähler geometry and D-brane probes. In some cases the hybrid limit is an infinite distance in moduli space and corresponds to a decompactification. In other cases the hybrid limit isat a finite distance and acquires massless D-branes. An example studied appears to correspond to a novel theory of supergravity with an SU(2) gauge symmetry where the gauge and gravitational couplings are necessarily tied to each other.

Keywords

D-branes Superstring Vacua Differential and Algebraic Geometry 

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Copyright information

© SISSA, Trieste, Italy 2010

Authors and Affiliations

  1. 1.Center for Geometry and Theoretical PhysicsDuke UniversityDurhamU.S.A.

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