Lorentz- and CPT-violating neutrinos from string/D-brane model

We show that the space-time foam model from string/D-brane theory predicts a scenario in which neutrinos can possess linearly energy dependent speed variation, together with an asymmetry between and antineutrinos, indicating possibility of Lorentz CPT symmetry violation for neutrinos. Such is supported by phenomenological conjecture possible associations IceCube ultrahigh-energy neutrino events gamma-ray bursts. It also consistent constraints set energy-losing decay channels (e.g., e+e? pair emission, or splitting) upon superluminal velocities. argue plausible violations energy-momentum conservation during may be responsible stable propagation these neutrinos, hence evasion relevant constraints.