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arXiv 0903.4985hep-ph
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中微子可能的量子引力效应探索I:中微子振荡实验中的退相干

Exploration of Possible Quantum Gravity Effects with Neutrinos I: Decoherence in Neutrino Oscillations Experiments

Alexander Sakharov, Nick Mavromatos, Anselmo Meregaglia, Andre Rubbia, Sarben Sarkar

摘要:

量子引力可能涉及相关度规场在某个固定背景值周围随机波动的模型。这种随机的重力模型可能会导致在这种波动时空中传播的物质的退相干。在大多数情况下,与三味标准中微子振荡相比,这导致在长基线实验中检测到的所有活性味的中微子更少。利用中微子振荡作为探针,讨论了CNGS和J-PARC光束在量子引力诱导退相干约束模型中的势能。我们使用尽可能多的模型无关的参数化,即使他们是出于特定的微观模型,适合预期的实验数据,产生量子引力退相干参数的界限。

英文摘要:

Quantum gravity may involve models with stochastic fluctuations of the associated metric field, around some fixed background value. Such stochastic models of gravity may induce decoherence for matter propagating in such fluctuating space time. In most cases, this leads to fewer neutrinos of all active flavours being detected in a long baseline experiment as compared to three-flavour standard neutrino oscillations. We discuss the potential of the CNGS and J-PARC beams in constraining models of quantum-gravity induced decoherence using neutrino oscillations as a probe. We use as much as possible model-independent parameterizations, even though they are motivated by specific microscopic models, for fits to the expected experimental data which yield bounds on quantum-gravity decoherence parameters.

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