ar X iv : h ep - t h / 93 11 13 8 v 1 2 3 N ov 1 99 3 Lattice models and N = 2 supersymmetry

ar X iv : h ep - t h / 93 11 13 2 v 1 2 2 N ov 1 99 3 Quantum integrable systems and representations of Lie algebras

Introduction A quantum many particle system on the line with an interaction potential U (x) is defined by the Hamiltonian

ar X iv : h ep - t h / 94 10 11 8 v 2 2 2 N ov 1 99 4 WILSON LOOPS , qq̄ and 3 q POTENTIALS , BETHE – SALPETER EQUATION

ar X iv : h ep - p h / 93 11 21 6 v 2 5 N ov 1 99 3 NONPERTURBATIVE EFFECTS IN QCD AT T

The background field formalism is used to implement nonpertur-bative QCD contributions into diagrammatic technic at T > 0. The leading terms both in the confining and nonconfining phase are identified at large N c and the transition temperature is calculated in this limit, which appears to be in good agreement with the Monte Carlo calculations.

ar X iv : h ep - t h / 97 11 12 7 v 1 1 7 N ov 1 99 7 1 Supersymmetry in Dimensions Beyond Eleven

Spacetime superalgebras with 64 or less number of real supercharges, containing the type IIB Poincaré superal-gebra in (9, 1) dimensions and the N = 1 Poincaré superalgebra in (10, 1) are considered. The restriction D ≤ 14, and two distinct possibilities arise: The N = (1, 0) superalgebra in (11, 3) dimensions, and the N = (2, 0) super-algebra in (10, 2) dimensions. Emphasizing the former, we d...

ar X iv : h ep - t h / 97 11 13 0 v 3 2 5 N ov 1 99 7 hep - th / 9711130 MRI - PHY / P 971131 String Network

Type IIB string theory admits a BPS configuration in which three strings (of different type) meet at a point. Using this three string configuration we construct a string network and study its properties. In particular we prove supersymmetry of this configuration. We also consider string lattices, which can be used to construct BPS states in toroidally compactified string theory.