11,701 research outputs found
String-String triality for d=4, Z_2 orbifolds
We investigate the perturbative and non-perturbative correspondence of a
class of four dimensional dual string constructions with N=4 and N=2
supersymmetry, obtained as Z_2 or Z_2 x Z_2 orbifolds of the type II, heterotic
and type I string. In particular, we discuss the heterotic and type I dual of
all the symmetric Z_2 x Z_2 orbifolds of the type II string, classified in
hep-th/9901123. .Comment: latex, 50 pages, figures, final published versio
Non-perturbative string connections
We discuss the duality between two type I compactifications to four
dimensions and an heterotic construction with spontaneous breaking of the N=4
supersymmetry to N=2. This duality allows us to gain insight into the
non-perturbative properties of these models. Through the analysis of the
gravitational corrections, we then investigate the connections between
four-dimensional, N=2 M-theory vacua constructed as orbifolds of type II,
heterotic, and type I strings.Comment: 7 pages, latex, to appear in the proceedings of the TMR meeting on
Quantum aspects of gauge theories, supersymmetry and unification, Paris, 1--7
September 199
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