Soft scalar masses in supergravity with horizontal U(1)_X gauge symmetry

Abstract

In supergravity with modular invariance and horizontal $U(1{)}_X$ gauge symmetry there is a relation between modular weights and $U(1{)}_X$ charges. The soft scalar masses are then strongly correlated with Yukawa matrices. The implications for FCNC are discussed.

Comments: 15 pages, LaTeX, Eq.(16) corrected