D6-branes and torsion | Zendy

Fernando Marchesano | Zendy

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D6-branes and torsion

Author(s) -

Fernando Marchesano

Publication year - 2006

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2006/05/019

Subject(s) - torsion (gastropod) , physics , brane , moduli , brane cosmology , torus , homology (biology) , theoretical physics , mathematical physics , geometry , quantum mechanics , mathematics , biology , anatomy , genetics , gene

The D6-brane spectrum of type IIA vacua based on twisted tori and RRbackground fluxes is analyzed. In particular, we compute the torsion factors ofthe (co)homology groups H_n and describe the effect that they have on D6-branephysics. For instance, the fact that H_3 contains Z_N subgroups explains why RRtadpole conditions are affected by geometric fluxes. In addition, the presenceof torsional (co)homology shows why some D6-brane moduli are lifted, and itsuggests how the D-brane discretum appears in type IIA flux compactifications.Finally, we give a clear, geometrical understanding of the Freed-Witten anomalyin the present type IIA setup, and discuss its consequences for theconstruction of semi-realistic flux vacua.Comment: 35 pages, 1 figure. One reference adde

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