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 publicationAIP Conference Proceedings
PublisherAmerican Institute of Physics Inc.
Pages220-224
Number of pages5
Volume1604
ISBN (Print)9780735412385
DOIs
StatePublished - 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

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

Fingerprint

neutrinos
universe
nuclear fusion
power spectra
confidence
flux density
microwaves
radiation

Keywords

  • cosmology
  • oscillations
  • sterile neutrinos

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Lunardini, C. (2014). Light sterile neutrinos in the early universe. In AIP Conference Proceedings (Vol. 1604, pp. 220-224). American Institute of Physics Inc.. https://doi.org/10.1063/1.4883434

Light sterile neutrinos in the early universe. / Lunardini, Cecilia.

AIP Conference Proceedings. Vol. 1604 American Institute of Physics Inc., 2014. p. 220-224.

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

Lunardini, C 2014, Light sterile neutrinos in the early universe. in AIP Conference Proceedings. vol. 1604, American Institute of Physics Inc., pp. 220-224, Workshop 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, 6/24/13. https://doi.org/10.1063/1.4883434
Lunardini C. Light sterile neutrinos in the early universe. In AIP Conference Proceedings. Vol. 1604. American Institute of Physics Inc. 2014. p. 220-224 https://doi.org/10.1063/1.4883434
Lunardini, Cecilia. / Light sterile neutrinos in the early universe. AIP Conference Proceedings. Vol. 1604 American Institute of Physics Inc., 2014. pp. 220-224
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