Fractional branes and N = 1 gauge theories
Artikel i vetenskaplig tidskrift, 2002

We discuss fractional D3-branes on the orbifold C^3/Z_2*Z_2. We study the open and the closed string spectrum on this orbifold. The corresponding N=1 theory on the brane has, generically, a U(N_1)*U(N_2)*U(N_3)*U(N_4) gauge group with matter in the bifundamental. In particular, when only one type of brane is present, one obtains pure N=1 Yang-Mills. We study the coupling of the branes to the bulk fields and present the corresponding supergravity solution, valid at large distances. By using a probe analysis, we are able to obtain the Wilsonian beta-function for those gauge theories that possess some chiral multiplet. Although, due to the lack of moduli, the probe technique is not directly applicable to the case of pure N=1 Yang-Mills, we point out that the same formula gives the correct result also for this case.

gauge theory

Fractional branes



Matteo Bertolini

Paolo Di Vecchia

Gabriele Ferretti

Chalmers, Institutionen för teoretisk fysik och mekanik, Matematisk fysik

R Marotta

Nuclera Physics

Vol. B 222-