Big Bang Nucleosynthesis

Abstract

A review of Big Bang Nucleosynthesis (BBN) is presented. Observations of deuterium and helium-4 are discussed. Some BBN restrictions on non-standard physics, especially on neutrino properties and time-variation of fundamental constants are given.

Comments: Invited Review Talk given at the VII Workshop on Topics in Astroparticle and Underground Physics (TAUP2001), Sept. 2001, L.N. Gran Sasso, Italy; 7 pages, 1 figure, latex (two typos corrected)