Light sterile neutrinos in the early universe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish (US)
Title of host publicationWorkshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2013 - 7th International Conference on Interconnections between Particle Physics and Cosmology, PPC* 2013
PublisherAmerican Institute of Physics Inc.
Pages220-224
Number of pages5
ISBN (Print)9780735412385
DOIs
StatePublished - Jan 1 2014
EventWorkshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2013 and 7th International Conference on Interconnections Between Particle Physics and Cosmology, PPC* 2013 - Lead/Deadwood, SD, United States
Duration: Jun 24 2013Jul 26 2013

Publication series

NameAIP Conference Proceedings
Volume1604
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherWorkshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2013 and 7th International Conference on Interconnections Between Particle Physics and Cosmology, PPC* 2013
CountryUnited States
CityLead/Deadwood, SD
Period6/24/137/26/13

Keywords

  • cosmology
  • oscillations
  • sterile neutrinos

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Plant Science
  • Physics and Astronomy(all)
  • Nature and Landscape Conservation

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  • Cite this

    Lunardini, C. (2014). Light sterile neutrinos in the early universe. In Workshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2013 - 7th International Conference on Interconnections between Particle Physics and Cosmology, PPC* 2013 (pp. 220-224). (AIP Conference Proceedings; Vol. 1604). American Institute of Physics Inc.. https://doi.org/10.1063/1.4883434