Effects of active-sterile neutrino mixing during primordial nucleosynthesis
| Autor: | M. M. Saez, Osvaldo Civitarese, M. E. Mosquera |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Nuclear and High Energy Physics
Particle physics Sterile neutrino Cosmology and Nongalactic Astrophysics (astro-ph.CO) STERILE NEUTRINO Ciencias Físicas General Physics and Astronomy FOS: Physical sciences Astrophysics Renormalization PRIMORDIAL NUCLEOSYNTHESIS Big Bang nucleosynthesis Primordial nucleosysthesis Neutrino oscillation Mixing (physics) Physics High Energy Physics::Phenomenology Física NEUTRINO MIXING Astronomía Distribution function Production (computer science) High Energy Physics::Experiment Neutrino Neutrino mixing CIENCIAS NATURALES Y EXACTAS Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP |
| Popis: | In the present work, we discuss the effects of the inclusion of sterile–active neutrino oscillations during the production of primordial light-nuclei. We assume that the sterile neutrino mass-eigenstate might oscillate with the two lightest active neutrino mass-eigenstates, with mixing angles ϕ1 and ϕ2. We also allow a constant renormalization (represented by a parameter (ζ)) of the sterile neutrino occupation factor. Taking ζ and the mixing angles as free parameters, we have computed distribution functions of active and sterile neutrinos and primordial abundances. Using observable data we set constrains in the free parameters of the model. It is found that the data on primordial abundances are consistent with small mixing angles and with a value of ζ smaller than 0.65 at 3σ level. Facultad de Ciencias Exactas Facultad de Ciencias Astronómicas y Geofísicas |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|