超高能光子和D-泡沫模型评述
Comments on Ultra-High-Energy Photons and D-Foam models
摘要：
在Maccione、Liberati和Sigl [arXiv：1003.5468]的近期工作之后，我们重新审视了由于GZK截止而导致的超高能光子的不可观测性可能对光子传播中的洛伦兹破坏模型施加的约束，该工作进一步进行了本作者的早期分析（Phys. Rev. D 63，12402（2001），[hep-th/0012216]）。我们认为，GZK截止约束是自然回避的D膜模型的时空泡沫最近提出的作者（物理。B 665，412（2008）[arXiv：0804.3566]），其中光子传播上的洛伦兹破坏效应与相互作用期间的可能效应无关。我们还注意到一种新的吸收机制，可以提供一个GZK样截止的光子在低尺度弦模型。
英文摘要：
We revisit the constraints that the non-observation of ultra-high-energy photons due to the GZK cutoff can impose on models of Lorentz violation in photon propagation, following recent work by Maccione, Liberati and Sigl [arXiv:1003.5468] that carries further an earlier analysis by the present authors (Phys. Rev. D 63,12402 (2001), [hep-th/0012216]). We argue that the GZK cutoff constraint is naturally evaded in the D-brane model of space-time foam presented recently by the present authors (Phys. Lett. B 665, 412 (2008) [arXiv:0804.3566]), in which Lorentz-violating effects on photon propagation are independent of possible effects during interactions. We also note a novel absorption mechanism that could provide a GZK-like cutoff for photons in low-scale string models.
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