The universe as a process of unique events
The universe as a process of unique events
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DOI：
10.1103/physrevd.90.084007
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发表时间：
2014-10-06
影响因子：
5
通讯作者：
Smolin, Lee
中科院分区：
文献类型：
--
作者：
Cortes, Marina;Smolin, Lee
我们描述了一类新的模型的量子时空的基础上充满活力的因果集，并表明，在自然条件下时空出现。这些是因果集合，其因果联系由能量和动量标记，守恒定律适用于事件。这些模型的动机是我们提出的微观物理学原理，它包含了时间的基本不可逆性。一个结果是，宇宙历史中的每一个事件都与其他事件有着独特的因果关系;这就需要一种新的动力学形式，可以应用于独特的事件。因此，我们引入了一种新的确定性动力学的因果集，其中新的事件是由一个规则，这是基于极端化的因果过去的事件集之间的区别的祖先事件对产生。这种动力学在时间上是不对称的，但是我们从1 + 1维模型的数值模拟中找到了证据，即出现了一种有效的动力学，它恢复了近似的时间反演对称性。最后，我们还提出了一个自然的twistorial表示的能量因果集。
We describe a new class of models of quantum space-time based on energetic causal sets and show that under natural conditions space-time emerges from them. These are causal sets whose causal links are labeled by energy and momentum and conservation laws are applied at events. The models are motivated by principles we propose govern microscopic physics which posit a fundamental irreversibility of time. One consequence is that each event in the history of the universe has a distinct causal relationship to the rest; this requires a novel form of dynamics which can be applied to uniquely distinctive events. We hence introduce a new kind of deterministic dynamics for a causal set in which new events are generated from pairs of progenitor events by a rule which is based on extremizing the distinctions between causal past sets of events. This dynamics is asymmetric in time, but we find evidence from numerical simulations of a 1 + 1 dimensional model, that an effective dynamics emerges which restores approximate time reversal symmetry. Finally we also present a natural twistorial representation of energetic causal sets.