Within effective heterotic superstring theory compactified on a six-torus we derive minimum energy (supersymmetric), static, spherically symmetric solutions, which are manifestly invariant under the… (More)

We consider a six-dimensional solitonic string solution described by a conformal chiral null model with non-trivial N = 4 superconformal transverse part. It can be interpreted as a five-dimensional… (More)

We present the explicit form for all the four dimensional, static, spherically symmetric solutions in (4 + n)-d Abelian Kaluza-Klein theory by performing a subset of SO(2, n) transformations… (More)

Static, four-dimensional (4-d) black holes (BH’s) in (4 + n)-d Kaluza-Klein (KK) theory with Abelian isometry and diagonal internal metric have at most one electric (Q) and one magnetic (P ) charges,… (More)

We study dilatonic domain walls specific to superstring theory. Along with the matter fields and metric the dilaton also changes its value in the wall background. We found supersymmetric (extreme)… (More)

We investigate the possibility of accommodating neutrino masses compatible with the MSW study of the Solar neutrino deficit within the minimal supersym-metric Standard Model. The " gravity-induced "… (More)