TY - JOUR
T1 - Sterile neutrinos, lepton asymmetries, primordial elements
T2 - How much of each?
AU - Chu, Yi Zen
AU - Cirelli, Marco
PY - 2006
Y1 - 2006
N2 - We investigate quantitatively the extent to which having a primordial leptonic asymmetry (nν≠nν̄) relaxes the bounds on light sterile neutrinos imposed by BBN and LSS. We adopt a few assumptions that allow us to solve the neutrino evolution equations over a broad range of mixing parameters and asymmetries. For the general cases of sterile mixing with the electron or muon neutrino, we identify the regions that can be reopened. For the particular case of a LSND-like sterile neutrino, soon to be rejected or confirmed by MiniBooNE, we find that an asymmetry of the order of 10-4 is needed to lift the conflicts with cosmology.
AB - We investigate quantitatively the extent to which having a primordial leptonic asymmetry (nν≠nν̄) relaxes the bounds on light sterile neutrinos imposed by BBN and LSS. We adopt a few assumptions that allow us to solve the neutrino evolution equations over a broad range of mixing parameters and asymmetries. For the general cases of sterile mixing with the electron or muon neutrino, we identify the regions that can be reopened. For the particular case of a LSND-like sterile neutrino, soon to be rejected or confirmed by MiniBooNE, we find that an asymmetry of the order of 10-4 is needed to lift the conflicts with cosmology.
UR - http://www.scopus.com/inward/record.url?scp=33749857772&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.74.085015
DO - 10.1103/PhysRevD.74.085015
M3 - 期刊論文
AN - SCOPUS:33749857772
SN - 1550-7998
VL - 74
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 8
M1 - 085015
ER -