@inproceedings{d5aa6f519d344b97b7ff3533a86f27af,
title = "Light sterile neutrinos in the early universe",
abstract = "Cosmological and terrestrial data suggests the number of light neutrinos may be greater than 3, motivating a careful reexamination of cosmological bounds on extra light species. Big bang nucleosynthesis constrains the number of relativistic neutrino species present during nucleosynthesis, NeffBBN, while measurements of the cosmic microwave background (CMB) angular power spectrum constrain the effective energy density in relativistic neutrinos at the time of matter-radiation equality, NeffCMB. We review a scenario with two sterile neutrinos and explore whether partial thermalization of the sterile states can ease the tension between cosmological constraints on NeffBBN and terrestrial data. We conclude that, still, two additional light sterile neutrinos species cannot fit all the data at the 95% confidence level.",
keywords = "cosmology, oscillations, sterile neutrinos",
author = "Cecilia Lunardini",
year = "2014",
doi = "10.1063/1.4883434",
language = "English (US)",
isbn = "9780735412385",
series = "AIP Conference Proceedings",
publisher = "American Institute of Physics Inc.",
pages = "220--224",
booktitle = "Workshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2013 - 7th International Conference on Interconnections between Particle Physics and Cosmology, PPC* 2013",
note = "Workshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2013 and 7th International Conference on Interconnections Between Particle Physics and Cosmology, PPC* 2013 ; Conference date: 24-06-2013 Through 26-07-2013",
}