D-brane probes on G(2) orbifolds
Artikel i vetenskaplig tidskrift, 2002

We consider type-IIB string theory on a seven dimensional orbifold with holonomy in G2. The motivation is to use D1-branes as probes of the geometry. The low energy theory on the D1-brane is a sigma-model with two real supercharges (N = (1,1) in two dimensional language). We study in detail the closed and open string sectors and propose a coupling of the twisted fields to the brane that modifies the vacuum moduli space so that the singularity at the origin is removed. Instead of coming from D-terms, which are not present here, the modification comes from a ``twisted'' mass term for the seven scalar multiplets on the brane. The proposed mechanism involves a generalization of the moment map.



string theory



Gabriele Ferretti

Chalmers, Institutionen för teoretisk fysik och mekanik, Matematisk fysik

Per Salomonson

Chalmers, Institutionen för teoretisk fysik och mekanik, Elementarpartikelfysik

Dimitrios Tsimpis

Journal of High Energy Physics

1126-6708 (ISSN) 1029-8479 (eISSN)

Vol. 03 04-



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