2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/183128We study solutions of the supergravity equations with the string-like sources moving with the speed of light. An exact solution is obtained for the gravitational field of a boosted ring string in any dimension greater than three.7 pages;v2 minor changes & references added, final in PRDHigh Energy Physics - TheoryGeneral Relativity and Quantum Cosmologytext