Non-BPS D-branes and enhanced symmetry in an asymmetric orbifold

Abstract

In this paper properties of D branes in a nine dimensional asymmetric orbifold are discussed, using a $(-1{)}^{F_L}{\sigma }_{1/2}$ projection, where $F_L$ is the leftmoving space-time fermion number and ${\sigma }_{1/2}$ is a freely acting shift of order two. There are two types of non BPS D branes, which are stable at $R>2$ and $R<2$ respectively. At R=2 there is a perturbative enhancement of gauge symmetry and the two types of branes are related by a global bulk symmetry transformation. At this point in the moduli space the associated boundary states are constructed using a free fermion representation of the theory. Some aspects of the enhancement of gauge symmetry in the S-dual type $\tilde{I}$ theory are discussed.

19 pages, harvmac (b), no figures, v2: reference added, v3: reference added, version to appear in JHEP

References in corpus (3)

• Stable non-BPS states in string theory: a pedagogical review
• Discrete torsion in non-geometric orbifolds and their open-string descendants
• TASI Lectures on Non-BPS D-Brane Systems

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• Little String Theories in Heterotic Backgrounds
• The Asymmetric CFT Landscape in D=4,6,8 with Extended Supersymmetry
• Dynamical Cobordisms in General Relativity and String Theory
• From Twists and Shifts to L-R asymmetric D-branes
• D-branes in Nonabelian Orbifolds with Discrete Torsion