Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1997-06-23
Nucl.Phys.B519:239-281,1998
Physics
High Energy Physics
High Energy Physics - Theory
58 pages, plain Latex, no figures. References corrected
Scientific paper
10.1016/S0550-3213(98)00007-8
We consider D=6, N=1, Z_M orbifold compactifications of heterotic strings in which the usual modular invariance constraints are violated. It is argued that in the presence of non-perturbative effects many of these vacua are nevertheless consistent. The perturbative massless sector can be computed explicitly from the perturbative mass formula subject to an extra shift in the vacuum energy. This shift is associated to a non-trivial antisymmetric B-field flux at the orbifold fixed points. The non-perturbative piece is given by five-branes either moving in the bulk or stuck at the fixed points, giving rise to Coulomb phases with tensor multiplets. The heterotic duals of some Type IIB orientifolds belong to this class of orbifold models. We also discuss how to carry out this type of construction to the D=4, N=1 case and specific $Z_M\times Z_M$ examples are presented in which non-perturbative transitions changing the number of chiral generations do occur.
Aldazabal Gerardo
Font Anamaria
Ibanez Luis E.
Uranga Angel M. .
Violero G.
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