Vacuum fluctuations and the small scale structure of spacetime.
Vacuum fluctuations and the small scale structure of spacetime.
复制标题
真空涨落和时空的小尺度结构。
DOI：
10.1103/physrevlett.107.021303
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发表时间：
2011
影响因子：
8.6
通讯作者：
J. Pitelli
中科院分区：
文献类型：
--
作者：
S. Carlip;R. A. Mosna;J. Pitelli
我们表明，真空波动的应力-能量张量在二维介子引力导致一个尖锐的聚焦光锥附近的普朗克尺度，有效地打破了空间成大量的因果关系断开的区域。这种现象在宇宙学中被称为“渐近沉默”，可能有助于解释量子引力的几个令人困惑的特征，包括在短距离内自发减少维度的证据。虽然我们的分析集中在一个简化的二维模型，我们认为，定性特征应该仍然存在于四个维度。
We show that vacuum fluctuations of the stress-energy tensor in two-dimensional dilaton gravity lead to a sharp focusing of light cones near the Planck scale, effectively breaking space up into a large number of causally disconnected regions. This phenomenon, called "asymptotic silence" when it occurs in cosmology, might help explain several puzzling features of quantum gravity, including evidence of spontaneous dimensional reduction at short distances. While our analysis focuses on a simplified two-dimensional model, we argue that the qualitative features should still be present in four dimensions.