非交换几何及其若干问题
Noncommutative Geometry and Some Issues
摘要：
最近对超高能宇宙射线的观测表明洛伦兹对称性有一个小的破坏。在离散/量子化时空的方案中，这样的违反是意料之中的。我们研究这种情况，并建议可以进行的测试，例如美国宇航局的GLAST卫星。这些考虑被外推到大尺度宇宙。
英文摘要：
Recent observations of Ultra High Energy Cosmic rays suggest a small violation of Lorentz symmetry. Such a violation is expected in schemes with discrete/quantized spacetime. We examine this situation and suggest tests which could be carried out, for example by NASA's GLAST Satellite. The considerations are extrapolated to the large scale cosmos.
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