2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/51778We use the low energy effective theory of string theory to investigate condensations of closed string tachyons propagating in the bulk. The c-function is related to the total energy of the system via the effective action. A possible modification of the c-theorem is discussed. We also deduce endpoints of the decays by investigating scalar potential of gauged supergravities. A string theory in the flat spacetime would be a possible endpoint.15 pages, references added, analysis of scalar potential is reconsidered, details of calculations includedHigh Energy Physics - Theorytext