Sigma-model symmetry in orientifold models

Abstract

We investigate in the simplest compact D=4 N=1 Type IIB orientifold models the sigma-model symmetry suggested by the proposed duality of these models to heterotic orbifold vacua. This symmetry is known to be present at the classical level, and is associated to a composite connection involving untwisted moduli in the low-energy supergravity theory. In order to study possible anomalies arising at the quantum level, we compute potentially anomalous one-loop amplitudes involving gluons, gravitons and composite connections. We argue that the effective vertex operator associated to the composite connection has the same form as that for a geometric deformation of the orbifold. Assuming this, we are able to compute the complete anomaly polynomial, and find that all the anomalies are canceled through a Green-Schwarz mechanism mediated by twisted RR axions, as previously conjectured. Some questions about the field theory interpretation of our results remain open.

Minor improvements

References in corpus (7)

• Standard-like Models with Broken Supersymmetry from Type I String Vacua
• Anomalies & Tadpoles
• Anomalies and inflow on D-branes and O-planes
• Sigma-model anomalies in compact type IIB orientifolds and Fayet-Iliopoulos terms
• Anomaly cancellation in D=4, N=1 orientifolds and linear/chiral multiplet duality
• Gauge and gravitational anomalies in D=4 N=1 orientifolds
• Target-Space Duality in Heterotic and Type I Effective Lagrangians

Cited by in corpus (6)

• Kahler Anomalies in Supergravity and Flux Vacua
• CP and Flavour in Effective Type I String Models
• Phenomenology of Twisted Moduli in Type I String Inspired Models
• Twisted Moduli Stabilization in Type I String Models
• Target-space anomalies and elliptic indices in heterotic orbifolds
• Twisted Moduli and Supersymmetry Breaking