论文标题
一次，两次还是没有时间？
One time, two times, or no time?
论文作者
论文摘要
基本物理学的当代研究计划似乎表明可能有两次（物理）时间 - 或根本没有。本文在量子引力的背景下，尤其是在一种称为“环量子引力”的方法中开发的宇宙学模型，阐明了这些可能性，并解释了它们如何确保我们明显的时间世界。对这些模型的适当解释需要对（空间）时间出现的暂时性和时间意义进行谈判。
Contemporary research programs in fundamental physics appear to suggest that there could be two (physical) times---or none at all. This essay articulates these possibilities in the context of quantum gravity, and in particular of cosmological models developed in an approach called `loop quantum gravity', and explains how they could nevertheless underwrite our manifestly temporal world. A proper interpretation of these models requires a negotiation of an atemporal and a temporal sense of the emergence of (space)time.
