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arXiv 1602.08020hep-thgr-qc
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量子时空的热维度

Thermal dimension of quantum spacetime

Giovanni Amelino-Camelia, Francesco Brighenti, Giulia Gubitosi, Grasiele Santos

摘要:

最近的结果表明,量子引力的一个关键十字路口是在短距离下时空的有效维数的表征,在短距离下时空的量子性质变得重要。这是相关的,特别是在文献中讨论的各种情况下的“动态降维”。我们在这里关注的事实是,相关的研究工作主要是基于分析的“谱维”,这涉及到一个非物理的欧几里得化的时空,是高度敏感的理论的外壳外的属性。如图所示,同一物理理论的不同表述可以有非常不同的谱维数。我们建议,动力学降维应描述的“热维”,我们在这里介绍,一个概念,只依赖于理论的物理内容。我们分析了几个模型与动力学减少的光谱尺寸和我们的热尺寸,特别是发现一些情况下,热和光谱尺寸一致,但也有一些情况下,光谱尺寸有令人困惑的属性,而热尺寸给出了一个不同的和有意义的图片。

英文摘要:

Recent results suggest that a crucial crossroad for quantum gravity is the characterization of the effective dimension of spacetime at short distances, where quantum properties of spacetime become significant. This is relevant in particular for various scenarios of "dynamical dimensional reduction" which have been discussed in the literature. We are here concerned with the fact that the related research effort has been based mostly on analyses of the "spectral dimension", which involves an unphysical Euclideanization of spacetime and is highly sensitive to the off-shell properties of a theory. As here shown, different formulations of the same physical theory can have wildly different spectral dimension. We propose that dynamical dimensional reduction should be described in terms of the "thermal dimension" which we here introduce, a notion that only depends on the physical content of the theory. We analyze a few models with dynamical reduction both of the spectral dimension and of our thermal dimension, finding in particular some cases where thermal and spectral dimension agree, but also some cases where the spectral dimension has puzzling properties while the thermal dimension gives a different and meaningful picture.

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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