2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52804We review extra-dimensional and 4D cosmological scenarios through the effective Friedmann evolution on a brane. Some features involving noncommutative geometry and scalar/tachyon slow-roll inflation are considered.12 pages, 2 figures. Talk given at DESY Theory Workshop 2004 (Hamburg, Sep. 28 - Oct. 1, 2004)High Energy Physics - TheoryAstrophysicsGeneral Relativity and Quantum Cosmologytext