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arXiv 1109.0118gr-qchep-latquant-ph
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拓扑均匀因果网络的时空涌现

Emergence of Space-Time from Topologically Homogeneous Causal Networks

Giacomo Mauro D'Ariano, Alessandro Tosini

摘要:

我们研究闵可夫斯基时空的因果网络的出现。与以前的方法不同,我们要求网络是拓扑同构的,因此度量是从纯事件计数中得出的。从事件中涌现有一个操作动机,要求每一个物理量-包括时空-通过精确的测量程序来定义。拓扑齐性是时空度规从因果联系的纯拓扑中涌现出来的必要条件,而物理齐性则对应于物理定律的普适性。我们详细分析了1+1维的情况。如果我们把因果关系看作是经典信息的交换,我们就可以通过爱因斯坦协议建立坐标系,这就产生了数字版的洛伦兹变换。在计算类比中,叶状构造可以被认为是在并行分布式计算中调用独立子程序(对应于因果独立事件)的全局时钟的同步。因此,洛伦兹时间膨胀表现为在时钟的一个滴答声内叶子密度的增加,而空间收缩则是由每片叶子上事件密度的相应减少引起的。建立坐标系的操作过程引入了相邻事件之间的原则上的不可分割性,从而导致粗粒度的网络,事件的厚度是观察者的时钟的函数。

英文摘要:

We study the emergence of Minkowski space-time from a causal network. Differently from previous approaches, we require the network to be topologically homogeneous, so that the metric is derived from pure event-counting. Emergence from events has an operational motivation in requiring that every physical quantity---including space-time---be defined through precise measurement procedures. Topological homogeneity is a requirement for having space-time metric emergent from the pure topology of causal connections, whereas physically homogeneity corresponds to the universality of the physical law. We analyze in detail the case of 1+1 dimensions. If we consider the causal connections as an exchange of classical information, we can establish coordinate systems via an Einsteinian protocol, and this leads to a digital version of the Lorentz transformations. In a computational analogy, the foliation construction can be regarded as the synchronization with a global clock of the calls to independent subroutines (corresponding to the causally independent events) in a parallel distributed computation. Thus the Lorentz time-dilation emerges as an increased density of leaves within a single tic-tac of a clock, whereas space-contraction results from the corresponding decrease of density of events per leaf. The operational procedure of building up the coordinate system introduces an in-principle indistinguishability between neighboring events, resulting in a network that is coarse-grained, the thickness of the event being a function of the observer's clock.

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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