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arXiv 0903.0318astro-ph.HEastro-ph.COgr-qchep-phhep-th
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高能gamma-ray天文学和弦论

High-Energy gamma-ray Astronomy and String Theory

Nick E. Mavromatos

摘要:

有观测,首先从魔术望远镜(2005年7月)和最近(2008年9月)从费米卫星望远镜,对非同时到达的高能光子从遥远的天体来源。在每种情况下,最高能量的光子与它们的低能量对应物相比被延迟。虽然这些高能光子源的天体物理学仍然不清楚,这种非同时到达可能是由于常规物理效应导致的非同时发射,然而,令人惊讶的是,观察到的时间延迟也可以很好地拟合量子引力中的某些场景,预测洛伦兹违反时空“泡沫”背景,平凡的亚光速真空折射率被约化普朗克质量量级的量子引力尺度线性抑制。在这个教学演讲中,我讨论了魔术和费米发现在这种情况下,我认为在弦/膜理论的时空泡沫的理论模型,可以容纳这些实验的结果与洛伦兹不变性的所有其他严格的测试。然而,我强调目前的模糊性/不确定性的来源机制,这需要解决之前,就量子引力泡沫情景得出明确的结论。

英文摘要:

There have been observations, first from the MAGIC Telescope (July 2005) and quite recently (September 2008) from the FERMI Satellite Telescope, on non-simultaneous arrival of high-energy photons from distant celestial sources. In each case, the highest energy photons were delayed, as compared to their lower-energy counterparts. Although the astrophysics at the source of these energetic photons is still not understood, and such non simultaneous arrival might be due to non simultaneous emission as a result of conventional physics effects, nevertheless, rather surprisingly, the observed time delays can also fit excellently some scenarios in quantum gravity, predicting Lorentz violating space-time "foam" backgrounds with a non-trivial subluminal vacuum refractive index suppressed linearly by a quantum gravity scale of the order of the reduced Planck mass. In this pedagogical talk, I discuss the MAGIC and FERMI findings in this context and I argue on a theoretical model of space-time foam in string/brane theory that can accommodate the findings of those experiments in agreement with all other stringent tests of Lorentz invariance. However, I stress the current ambiguities/uncertainties on the source mechanisms, which need to be resolved first before definite conclusions are reached regarding quantum gravity foam scenarios.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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