TY - JOUR
T1 - Stringent constraint on neutrino Lorentz invariance violation from the two IceCube PeV neutrinos
AU - Borriello, Enrico
AU - Chakraborty, Sovan
AU - Mirizzi, Alessandro
AU - Serpico, Pasquale Dario
PY - 2013/6/24
Y1 - 2013/6/24
N2 - It has been speculated that Lorentz-invariance violation (LIV) might be generated by quantum-gravity (QG) effects. As a consequence, particles may not travel at the universal speed of light. In particular, superluminal extragalactic neutrinos would rapidly lose energy via the bremssthralung of electron-positron pairs (ν→νe+e-), damping their initial energy into electromagnetic cascades, a figure constrained by Fermi-Large Area Telescope data. We show that the two cascade neutrino events with energies around 1 PeV recently detected by IceCube - if attributed to extragalactic diffuse events, as it appears likely - can place the strongest bound on LIV in the neutrino sector, namely, δ=(v2-1)<O(10 -18), corresponding to a QG scale MQG 105MPl (MQG 10-4MPl) for a linear (quadratic) LIV, at least for models inducing superluminal neutrino effects (δ>0).
AB - It has been speculated that Lorentz-invariance violation (LIV) might be generated by quantum-gravity (QG) effects. As a consequence, particles may not travel at the universal speed of light. In particular, superluminal extragalactic neutrinos would rapidly lose energy via the bremssthralung of electron-positron pairs (ν→νe+e-), damping their initial energy into electromagnetic cascades, a figure constrained by Fermi-Large Area Telescope data. We show that the two cascade neutrino events with energies around 1 PeV recently detected by IceCube - if attributed to extragalactic diffuse events, as it appears likely - can place the strongest bound on LIV in the neutrino sector, namely, δ=(v2-1)<O(10 -18), corresponding to a QG scale MQG 105MPl (MQG 10-4MPl) for a linear (quadratic) LIV, at least for models inducing superluminal neutrino effects (δ>0).
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U2 - 10.1103/PhysRevD.87.116009
DO - 10.1103/PhysRevD.87.116009
M3 - Article
AN - SCOPUS:84879527494
SN - 1550-7998
VL - 87
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 11
M1 - 116009
ER -