constraints on active=sterile neutrino

O. CIVITARESE; M. MOSQUERA

PHYS. REV. - C

AMER PHYSICAL SOC

Lugar: New York; Año: 2011 vol. 84 p. 65803 - 65810

0556-2813

Starting from the calculation of the neutrino distribution function, as a function of the active-sterile neutrinomixing parameters, we calculate primordial abundances of light nuclei (D, 4He, and 7Li) using a modified versionof Kawano?s code. The active-sterile neutrino mixing parameters and the baryon-to-photon ratio (ηB) enter thecalculation as free parameters. By using the observational data of D, 4He, and 7Li, we set constraints on ηB andon the active-sterile neutrino mixing parameters. It is found that the value for the baryon-to-photon ratio dependsstrongly on the inclusion of 7Li data in the sample, while the value for the mixing angles remain smal