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arXiv 1302.6966gr-qcmath.DGmath.GT
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从background radiation恢复平坦时空的几何

Recovering the geometry of a flat spacetime from background radiation

Francesco Bonsante, Catherine Meusburger, Jean-Marc Schlenker

摘要:

我们考虑2+1和3+1维的全局双曲平坦时空,其中在$r\to 0$的宇宙时间的$r$ -能级表面上发射均匀的光信号。我们发现,这个信号的频率,由一个固定的观察员,是一个定义良好的,有界的函数,一般是不连续的。这定义了一个模型与各向异性的背景辐射,包含有关初始奇异性的时空信息。在2+1维中,我们证明了这个观测到的频率函数在适当的时空扰动下是稳定的,并且在一定条件下,它包含了足够的信息来恢复它的几何和拓扑。我们计算这个频率函数的几个简单的例子的近似。

英文摘要:

We consider globally hyperbolic flat spacetimes in 2+1 and 3+1 dimensions, in which a uniform light signal is emitted on the $r$-level surface of the cosmological time for $r\to 0$. We show that the frequency of this signal, as perceived by a fixed observer, is a well-defined, bounded function which is generally not continuous. This defines a model with anisotropic background radiation that contains information about initial singularity of the spacetime. In dimension 2+1, we show that this observed frequency function is stable under suitable perturbations of the spacetime, and that, under certain conditions, it contains sufficient information to recover its geometry and topology. We compute an approximation of this frequency function for a few simple examples.

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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