In this paper, we propose a new Swampland condition, the Trans-Planckian Censorship Conjecture (TCC), based on the idea that in a consistent quantum theory of gravity sub-Planckian quantum fluctuations should remain quantum and never become larger than the Hubble horizon and freeze in an expanding universe. Applied to the case of scalar fields, it leads to conditions that are similar to the refined dS Swampland conjecture. For large field ranges, TCC is stronger than the dS Swampland conjecture but it is weaker for small field ranges. In particular for asymptotic regions of field space, TCC leads to a bound $|V'|\geq {2\over \sqrt{(d-1)(d-2)}}V$, which is consistent with all known cases in string theory. Like the dS Swampland conjecture, the TCC forbids long-lived meta-stable dS spaces, but it does allow sufficiently short-lived ones.

中文翻译：

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跨普朗克审查制度和沼泽地

在本文中，我们提出了一种新的沼泽条件，即跨普朗克审查猜想 (TCC)，其基础是在一致的引力量子理论中，亚普朗克量子涨落应保持量子态，永远不会大于哈勃视界，并且冻结在膨胀的宇宙中。应用于标量场的情况，它会导致类似于精炼的 dS Swampland 猜想的条件。对于大视场范围，TCC 比 dS Swampland 猜想更强，但对于小视场范围则较弱。特别是对于场空间的渐近区域，TCC 导致一个界限 $|V'|\geq {2\over \sqrt{(d-1)(d-2)}}V$，这与所有已知情况一致在弦论中。与 dS Swampland 猜想一样，TCC 禁止长寿命的亚稳定 dS 空间，但它确实允许足够短的寿命。