2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/14154A detailed analysis of primordial nucleosynthesis predictions for light element abundances is performed. Contents: 1. The standard cosmology: an overview. 2. Primordial nucleosynthesis. 3. The Born rates for n<->p reactions. 4. Finite nucleon mass corrections. 5. QED thermal radiative corrections. 6. Calculations of Big Bang Nucleosynthesis. Results.latex2e, Ph.D. thesis, 138 pages, 33 figures, 15 tablesAstrophysicsHigh Energy Physics - Phenomenologytext