期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 4, 页码 -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
- Consolider Ingenio projects [CSD2007-00060, CSD2008-00037]
- Spanish Grant of the MINECO [FPA2011-29678]
- FQRNT
- European contract [FP7-PEOPLE-2011-ITN]
- European Union through the FP7 Marie Curie Actions CIG NeuProbes [PCIG11-GA-2012-321582]
- Spanish MINECO through the Ramon y Cajal programme [RYC2011-07710]
- Spanish MINECO [FPA2009-09017]
- Spanish MINECO (Centro de excelencia Severo Ochoa Program) [SEV-2012-0249]
- Giovani ricercatori of the University of Ferrara
- [PROMETEOII/2014/050]
- [PITN-GA-2011-289442-INVISIBLES]
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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