No-scale supergravity is a leading candidate for an effective theory that describes nature at
energies below the Planck scale (mp≌ 10 19 GeV). Its virtues, such as an automatically …

This review is devoted to open strings, and in particular to the often surprising features of
their spectra. It follows and summarizes developments that took place mainly at the …

String Theory comprises two volumes which give a comprehensive and pedagogic account
of the subject. Volume 1, first published in 1998, provides a thorough introduction to the …

We propose new mechanisms for understanding neutrino masses in superstring models that
contain E 6-singlet zero-mass fields after compactification. We show that the low-energy …

Expansion of supersymmetric string theory suggests that the leading quadratic curvature
correction to the Einstein action is the Gauss-Bonnet invariant. We show that this model has …

We study conformal field theories with a finite number of primary fields with respect to some
chiral algebra. It is shown that the fusion rules are completely determined by the behavior of …

We derive a formula which expresses any closed string tree amplitude in terms of a sum of
the products of appropriate open string tree amplitudes. This formula is applicable to the …

We compute the effective action for an abelian vector field coupled to the virtual open Bose
string. The problem is exactly solved (in the “tree” and “one-loop” approximation for the …

This is an introduction to the properties of D-branes, topological defects in string theory on
which string endpoints can live. D-branes provide a simple description of various …

Information visualization is not only about creating graphical displays of complex and latent
information structures; it contributes to a broader range of cognitive, social, and collaborative …