BibTeX
@MISC{Marchesano_d6-branesand,
author = {Fernando Marchesano},
title = {D6-branes and torsion},
year = {}
}
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Abstract
Abstract: The D6-brane spectrum of type IIA vacua based on twisted tori ˜T 6 and RR background fluxes is analyzed. In particular, we compute the torsion factors of Hn(˜T 6, Z) and describe the effect that they have on D6-brane physics. For instance, the fact that H3(˜T 6, Z) contains ZN subgroups explains why RR tadpole conditions are affected by geometric fluxes. In addition, the presence of torsional (co)homology shows why some D6brane moduli are lifted, and it suggests how the D-brane discretum appears in type IIA flux compactifications. Finally, we give a clear, geometrical understanding of the Freed-Witten anomaly in the present type IIA setup, and discuss its consequences for the construction of semi-realistic flux vacua. Contents 1. Motivation and Summary
Keyphrases
type iia vacuum d6brane modulus d-brane discretum torsion factor freed-witten anomaly rr tadpole condition type iia flux compactifications semi-realistic flux vacuum d6-brane physic present type iia setup homology show geometrical understanding twisted torus geometric flux zn subgroup d6-brane spectrum rr background flux
