This is a pedagogical review article surveying the various approaches towards
understanding gauge coupling unification within string theory. As is well known, one of the …

The theoretical motivation for exotic stable massive particles (SMPs) and the results of SMP
searches at non-collider facilities are reviewed. SMPs are defined such that they would be …

We search for N= 2, d= 4 theories which can be realized both as heterotic string
compactifications on K3× T2 and as type II string compactifications on Calabi-Yau threefolds …

Classical vacua of the heterotic string corresponding to c= 9, N=(2, 2) superconformal
theories on the world sheet yield low-energy effective field theories with N= 1 space-time …

Designed as a sequel to the authors' Introduction to Gauge Field Theory, Supersymmetric
Gauge Field Theory and String Theory introduces first-year graduate students to …

Within a class of superstring vacua which have an additional nonanomalous U (1)′ gauge
factor, we address the scale of the U (1)′ symmetry breaking and constraints on the exotic …

The subject of these lectures is the construction of supersymmetric soliton solutions to
superstring theory. A brief review of solitons and instantons in supersymmetric theories is …

The expected proton and neutrino fluxes from decays of massive metastable relic particles
are calculated using the HERWIG QCD event generator. The predicted proton spectrum can …

We systematically study the extension of the supersymmetric standard model (SSM) by an
anomaly-free discrete gauge symmetry ZN. We extend the work of Ibáñez and Ross with N …

We present supersymmetric, tadpole-free d= 4, N= 1 orientifold vacua with a three family
chiral fermion spectrum that is identical to that of the standard model. Starting with all simple …