August 28, 2022 to September 1, 2022
Serbian Academy of Sciences and Arts – SASA
Europe/Belgrade timezone

Updated BBN cosmological constraints on Beyond Standard Model physics

S02-AA-101
Aug 30, 2022, 5:00 PM
15m
Hall 301F (MI SASA)

Hall 301F

MI SASA

Board: S02-AA-101
Oral presentation (virtual) S02 Astronomy and Astrophysics S02 Astronomy and Astrophysics

Speaker

Daniela Kirilova (Institute of Astronomy and NAO, Bulgarian Academy if Sciences)

Description

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% 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.

Primary authors

Daniela Kirilova (Institute of Astronomy and NAO, Bulgarian Academy if Sciences) Mariana Panayotova (Institute of Astronomy and NAO, Bulgarian Academy if Sciences) Emmanuil Chizhov (Institute of Astronomy and NAO, Bulgarian Academy if Sciences)

Presentation materials