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arXiv 0901.2932astro-ph.HEgr-qc
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用极高能Gamma-Ray仪器探索量子引力--前景和局限性

Exploring Quantum Gravity with Very-High-Energy Gamma-Ray Instruments - Prospects and Limitations

Robert Wagner

摘要:

一些量子引力(QG)模型违背了洛伦兹不变性,并预测光速与能量的依赖关系,导致高能伽马射线信号在宇宙学距离上传播的色散。在宇宙学距离的伽马射线暴(GRB)发射的伽玛射线中观测到的短持续时间子结构的色散极限为洛伦兹不变性破坏(LIV)提供了有趣的界限。2005年Mkn 501和2006年PKS 2155-304的活动星系核(AGN)非常高能量伽马射线发射中前所未有的快速耀斑观测结果导致光旅行观测对LIV的限制最大,接近普朗克质量尺度,QG效应被认为变得重要。我回顾了使用伽玛暴和活动星系核耀斑事件的LIV搜索的现状,并讨论了光旅行时间分析的局限性和未来仪器在伽玛射线领域的前景。

英文摘要:

Some models for quantum gravity (QG) violate Lorentz invariance and predict an energy dependence of the speed of light, leading to a dispersion of high-energy gamma-ray signals that travel over cosmological distances. Limits on the dispersion from short-duration substructures observed in gamma-rays emitted by gamma-ray bursts (GRBs) at cosmological distances have provided interesting bounds on Lorentz invariance violation (LIV). Recent observations of unprecedentedly fast flares in the very-high energy gamma-ray emission of the active galactic nuclei (AGNs) Mkn 501 in 2005 and PKS 2155-304 in 2006 resulted in the most constraining limits on LIV from light-travel observations, approaching the Planck mass scale, at which QG effects are assumed to become important. I review the current status of LIV searches using GRBs and AGN flare events, and discuss limitations of light-travel time analyses and prospects for future instruments in the gamma-ray domain.

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