古典主义的衡量标准
A Measure of Classicality
摘要：
我们根本不确定的量子宇宙的一个显著特征是它的准经典领域--经典物理学的确定性定律所适用的广泛的时间、地点和尺度。我们的准经典领域是我们宇宙的量子态和动力学的基本理论的一个涌现特征。我们的宇宙可以表现出许多类型的准经典领域，其特征在于不同的变量，不同的粗粒化水平，不同的时空位置，不同的经典物理学，以及不同的经典性水平。我们推测不同层次的古典性的可观察到的后果，特别是对信息收集和利用系统（IGUSes）把我们当作宇宙的观察者。
英文摘要：
A striking feature of our fundamentally indeterministic quantum universe is its quasiclassical realm -- the wide range of time place and scale in which the deterministic laws of classical physics hold. Our quasiclassical realmis an emergent feature of the fundamental theories of our universe's quantum state and dynamics. There are many types of quasiclassical realms our Universe could exhibit characterized by different variables, different levels of coarse-graining, different locations in spacetime, different classical physics, and different levels of classicality.We propose a measure of classicality for quasiclassical realms, We speculate on the observable consequences of different levels of classicality especially for information gathering and utilizing systems (IGUSes) such ourselves as observers of the Universe.
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