Lorentz noninvariant neutrino oscillations without neutrino mass

The bicycle model of Lorentz noninvariant neutrino oscillationswithout neutrinomasses naturally predicts maximal mixing and a 1/E dependence of the oscillation argument for �µ ! �� oscillations of atmospheric and long-baseline neutrinos, but cannot also simultaneously fit the data for solar neutrinosand KamLAND. We examine all nineteen possible structures of the Standard Model Extensionfor Lorentz noninvariant oscillations of massless neutrinosthat naturally have a 1/E dependence at high neutrinoenergy. Due to the lack of any evidence for direction dependence, we consider only direction-independent oscillations. Although we find a number of models with a 1/E dependence for atmospheric and long-baseline neutrinos, none can also simultaneously fit solar and KamLAND data.