论文标题
gateaculus：密度矩阵现实主义符合时间的箭头
The Wentaculus: Density Matrix Realism Meets the Arrow of Time
论文作者
论文摘要
物理基础中最困难的两个问题是（1）引起时间的箭头以及（2）量子力学的本体是什么。它们很困难，因为物理学的基本动力学定律没有特权的时间，而量子机械波函数描述了一种高维现实，这与我们的普通经历截然不同。 在本文中，我对“ withaculus”理论进行了描述和详细说明，这是量子宇宙中时间箭头的一种新方法，为这两个问题提供了统一的解决方案。 gateaculus的核心是（i）密度矩阵现实主义，这是宇宙的量子状态是客观但可能不纯净的想法，以及（ii）初始投影假说，这是一种选择独特的初始量子状态的新自然定律。在gateaculus上，宇宙的量子状态足够简单，可以成为法律，并且时间的箭头可以追溯到精确的边界条件。它消除了过去假设的内在模糊性，消除了统计假设，提供了更高程度的理论统一性，并包含了“强确定论”的自然实现。在同伴论文中，我详细介绍了密度矩阵现实主义。
Two of the most difficult problems in the foundations of physics are (1) what gives rise to the arrow of time and (2) what the ontology of quantum mechanics is. They are difficult because the fundamental dynamical laws of physics do not privilege an arrow of time, and the quantum-mechanical wave function describes a high-dimensional reality that is radically different from our ordinary experiences. In this paper, I characterize and elaborate on the ''Wentaculus'' theory, a new approach to time's arrow in a quantum universe that offers a unified solution to both problems. Central to the Wentaculus are (i) Density Matrix Realism, the idea that the quantum state of the universe is objective but can be impure, and (ii) the Initial Projection Hypothesis, a new law of nature that selects a unique initial quantum state. On the Wentaculus, the quantum state of the universe is sufficiently simple to be a law, and the arrow of time can be traced back to an exact boundary condition. It removes the intrinsic vagueness of the Past Hypothesis, eliminates the Statistical Postulate, provides a higher degree of theoretical unity, and contains a natural realization of ''strong determinism.'' I end by responding to four recent objections. In a companion paper, I elaborate on Density Matrix Realism.
