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arXiv 1003.5468astro-ph.HEgr-qchep-ph
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超高能光子作为弦时空泡沫模型中Lorentz对称性破坏的探针

Ultra high energy photons as probes of Lorentz symmetry violations in stringy space-time foam models

Luca Maccione, Stefano Liberati, Guenter Sigl

摘要:

来自河外源的不同能量的伽马射线之间的时间延迟经常被用来探测违反洛伦兹对称性的量子引力模型。有人声称,这些时间延迟可以用量子引力场景来解释,或者至少对量子引力场景施加了最强的约束,这些场景不能在有效场论框架内进行,例如时空泡沫,D膜模型。在这里,我们表明,这个模型将预测太多的光子在超高能宇宙射线通量是一致的观察。由此产生的时空泡沫模型的约束比时间延迟的限制要强得多,并且允许洛伦兹违反效应太小,无法解释观察到的时间延迟。

英文摘要:

The time delays between gamma-rays of different energies from extragalactic sources have often been used to probe quantum gravity models in which Lorentz symmetry is violated. It has been claimed that these time delays can be explained by or at least put the strongest available constraints on quantum gravity scenarios that cannot be cast within an effective field theory framework, such as the space-time foam, D-brane model. Here we show that this model would predict too many photons in the ultra-high energy cosmic ray flux to be consistent with observations. The resulting constraints on the space-time foam model are much stronger than limits from time delays and allow for Lorentz violations effects way too small for explaining the observed time delays.

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