2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/230299We add an initial nonhomogeneous perturbation to an otherwise homogeneous condensing tachyon background and compute its space time energy-momentum tensor from worldsheet string theory. We show that in the far future the energy-momentum tensor corresponds to nonhomogeneous pressureless tachyon matter.8 pages. v2: minor corrections, to appear in PRDHigh Energy Physics - TheoryGeneral Relativity and Quantum Cosmologytext