Freed-Witten anomaly in general flux compactification

Details Freed-Witten anomaly in general flux compactification Freed-Witten anomaly in general flux compactification

2006-12-11

arxiv.org/abs/hep-th/0612088v3

Phys.Rev.D76:106015,2007

Physics

High Energy Physics

High Energy Physics - Theory

v3: Shortened version. Examples added. Main results unchanged

Scientific paper

10.1103/PhysRevD.76.106015

Turning on a NS-NS three-form flux in a compact space drives some D-branes to be either Freed-Witten anomalous or unstable to decay into fluxes by the appearance of instantonic branes. By applying T-duality on a toroidal compactification, the NS-flux is transformed into metric fluxes. We propose a T-dual version of the Atiyah-Hirzebruch Spectral Sequence upon which we describe the Freed-Witten anomaly and the brane-flux transition driven by NS and metric fluxes in a twisted torus. The required conditions to cancel the anomaly and the appearance of new instantonic branes are also described. In addition, we give an example in which all D6-branes wrapping Freed-Witten anomaly-free three-cycles in the twisted torus T^6/Z(2)XZ(2) are nevertheless unstable to be transformed into fluxes. Evenmore we find a topological transformation between RR, NS-NS and metric fluxes driven by a chain of instantonic branes.

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