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 neutrinos and antineutrinos, indicating the possibility of Lorentz and CPT symmetry violation for neutrinos. Such a scenario is supported by a phenomenological conjecture from the possible associations of IceCube ultrahigh-energy neutrino events with the gamma-ray bursts. It is also consistent with the constraints set by the energy-losing decay channels (e.g., e(+)e(-) pair emission, or neutrino splitting) upon superluminal neutrino velocities. We argue that the plausible violations of energy-momentum conservation during decay may be responsible for the stable propagation of these neutrinos, and hence for the evasion of relevant constraints. (c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3).

Automated summary

We present a scenario based on the space-time foam model from string/D-brane theory in which neutrinos can have linearly energy dependent speed variation and an asymmetry between neutrinos and antineutrinos, suggesting a potential violation of Lorentz and CPT symmetry for neutrinos. This scenario is supported by a phenomenological conjecture linking IceCube ultrahigh-energy neutrino events with gamma-ray bursts and is consistent with constraints imposed by energy-losing decay channels on superluminal neutrino velocities. We argue that violations of energy-momentum conservation during decay could explain the stable propagation of these neutrinos and the evasion of relevant constraints.