为什么东西会掉下来
Why things fall
摘要：
在本文中，我们讨论内部相对论，最近的计划，以解决问题的量子引力。在我们的方法中，我们改变了时空和物质之间的关系。目前，我们认为物质在时空中传播。爱因斯坦的方程编码了时空如何由于物质的存在而弯曲，以及时空如何反过来告诉物质如何传播。在内部实在性中，物质和时空不再作为不同的实体存在，相反，它们同时从一个潜在的量子系统中产生。正是通过突现物质的自由度，几何学才得以推导。我们把我们的程序命名为内部相对论，以强调从内部观察者的角度观察系统的重要性。我们认为，狭义相对论是这种观点的自然结果。内部相对论最重要的新方面涉及引力如何出现。它不仅是一个新的引力量子理论，而且是一个新的引力理论。我们还认为，一个大质量的物体的存在意味着曲率。特别是，我们表明，牛顿引力出现在适当的限制。我们的论证意味着没有引力就没有传播。
英文摘要：
In this paper we discuss Internal Relativity, a recent program to address the problem of quantum gravity. In our approach we change the relationship between spacetime and matter. Currently we view matter as propagating on spacetime. Einstein's equations encode how spacetime curves due to the presence of matter and how spacetime, in turn, tells matter how to propagate. In internal realtivity matter and spacetime cease to exist as distinct entities, rather, they arise simultaneously from an underlying quantum system. It is through the emergent matter degrees of freedom that geometry is inferred. We have termed our program Internal Relativity to stress the importance of looking at the system from the point of view of an internal observer. We argue that special relativity is then a natural consequence of this viewpoint. The most important new aspect of Internal Relativity involves how gravity appears. It is not just a new quantum theory of gravity but a new theory of gravity. We also argue that the presence of a massive object implies curvature. In particular we show that Newtonian gravity arises in the appropriate limit. Our argument implies that there is no propagation without gravitation.
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