2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/102997I review the motivation for the early-time cosmic acceleration stage in expanding universe and discuss simple inflationary scenarios. Preheating and reheating are considered in great detail. This is a sample chapter from my book "Physical Foundations of Cosmology" published by Cambridge University Press (2005).AstrophysicsHigh Energy Physics - Theorytext