4.6 Article

Revisiting cosmological bounds on sterile neutrinos

出版社

IOP Publishing Ltd
DOI: 10.1088/1475-7516/2015/04/006

关键词

particle physics - cosmology connection; cosmological neutrinos; cosmology of theories beyond the SM

资金

  1. Consolider Ingenio projects [CSD2007-00060, CSD2008-00037]
  2. Spanish Grant of the MINECO [FPA2011-29678]
  3. FQRNT
  4. European contract [FP7-PEOPLE-2011-ITN]
  5. European Union through the FP7 Marie Curie Actions CIG NeuProbes [PCIG11-GA-2012-321582]
  6. Spanish MINECO through the Ramon y Cajal programme [RYC2011-07710]
  7. Spanish MINECO [FPA2009-09017]
  8. Spanish MINECO (Centro de excelencia Severo Ochoa Program) [SEV-2012-0249]
  9. Giovani ricercatori of the University of Ferrara
  10. [PROMETEOII/2014/050]
  11. [PITN-GA-2011-289442-INVISIBLES]

向作者/读者索取更多资源

We employ state-of-the art cosmological observables including supernova surveys and BAO information to provide constraints on the mass and mixing angle of a non-resonantly produced sterile neutrino species, showing that cosmology can effectively rule out sterile neutrinos which decay between BBN and the present day. The decoupling of an additional heavy neutrino species can modify the time dependence of the Universe's expansion between BBN and recombination and, in extreme cases, lead to an additional matter-dominated period; while this could naively lead to a younger Universe with a larger Hubble parameter, it could later be compensated by the extra radiation expected in the form of neutrinos from sterile decay. However, recombination-era observables including the Cosmic Microwave Background (CMB), the shift parameter R-CMB and the sound horizon r(s) from Baryon Acoustic Oscillations (BAO) severely constrain this scenario. We self-consistently include the full time-evolution of the coupled sterile neutrino and standard model sectors in an MCMC, showing that if decay occurs after BBN, the sterile neutrino is essentially bounded by the constraint sin(2) theta less than or similar to 0.026(m(s)/eV)(-2).

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