Big Bang Nucleosynthesis (BBN) is one of the most reliable
tests of Beyond Standard Model (BSM) physics due to the remarkable
concordance between the theoretically predicted and the derived from
observations abundances of light elements produced primordially.
Recently the primordial light elements D and He-4 were determined
with higher accuracy. This allows to update and strengthen the Big
Bang Nucleosynthesis constraints on physics beyond Standard Model.
We consider several models representing BSM physics. We derived
updated more stringent BBN constraints on electron-sterile neutrino
oscillations parameters corresponding to 1 percent accuracy of the
determination of the primordial produced Helium-4. We present new
cosmological constraints on the number of the effective degrees of
freedom of light particles during the BBN epoch and updated the BBN
constraints on the freezing temperature of the light sterile
neutrinos.