ar X iv : h ep - t h / 99 11 12 0 v 1 1 6 N ov 1 99 9 Coset - Space String Compactification Leading To 14 Subcritical Dimensions

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 - p h / 95 11 45 6 v 1 2 9 N ov 1 99 5 hep - ph / yymmddd FOUR - DIMENSIONAL SUPERSTRING MODELS

These five lectures give an elementary introduction to perturbative superstring theory, superstring phenomenology, and the fermionic construction of perturbative string models. These lectures assume no prior knowledge of string theory.

ar X iv : h ep - t h / 99 11 16 3 v 2 3 0 N ov 1 99 9 hep - th / 9911163 Logarithmic Operators in AdS 3 / CFT 2

We discuss the relation between singletons in AdS 3 and logarithmic operators in the CFT on the boundary. In 2 dimensions there can be more logarithmic operators apart from those which correspond to singletons in AdS, because logarithmic operators can occur when the dimensions of primary fields differ by an integer instead of being equal. These operators may be needed to account for the greybod...

ar X iv : h ep - p h / 99 11 40 8 v 1 19 N ov 1 99 9 Quark Matter 99 Summary : Hadronic Signals

ar X iv : h ep - t h / 99 11 24 8 v 1 3 0 N ov 1 99 9 Casimir energy of a non - uniform string

The Casimir energy of a non-uniform string built up from two pieces with different speed of sound is calculated. A standard procedure of subtracting the energy of an infinite uniform string is applied, the subtraction being interpreted as the renormalization of the string tension. It is shown that in the case of a homogeneous string this method is completely equivalent to the zeta renormalizati...