2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/190702We examine the possibility of rolling tachyon to play the dual roll of inflaton at early epochs and dark matter at late times. We argue that enough inflation can be generated with the rolling tachyon either by invoking the large number of branes or brane world assisted inflation. However, reheating is problematic in this model.RevTeX 4 pages, Talk delivered in PASCOS held at TIFR (Mumbai) from 3rd Jan to 9th Jan. To appear in the proceedings of PASCOS to be published in a special issue of PramanaHigh Energy Physics - TheoryAstrophysicsGeneral Relativity and Quantum Cosmologytext