In the last two decades the anti-de Sitter/conformal field theory (AdS/CFT) correspondence has emerged as a focal point of many research interests. In particular, it functions as a stepping stone to a still-missing full quantum theory of gravity. In this context, a pivotal question is if and how cosmological physics can be studied using AdS/CFT. Motivated by string theory, braneworld cosmologies propose that our universe is a four-dimensional membrane embedded in a bulk five-dimensional AdS spacetime. We show how such a scenario can be microscopically realized in AdS/CFT using special field theory states dual to an ‘end-of-the-world brane’ moving in a charged black hole spacetime. Observers on the brane experience cosmological physics and approximately four-dimensional gravity, at least locally in spacetime. This result opens a path towards a description of quantum cosmology and the simulation of cosmology on quantum machines.

在过去的二十年中，反de Sitter /共形场理论（AdS / CFT）对应已成为许多研究兴趣的焦点。尤其是，它是仍然缺少的全量子引力理论的垫脚石。在这种情况下，一个关键性的问题是使用AdS / CFT是否以及如何研究宇宙物理学。受弦理论的启发，braneworld宇宙学认为我们的宇宙是嵌入在庞大的5维AdS时空中的4维膜。我们展示了如何使用特殊场论状态在AdS / CFT中以微观方式实现这种情况，这种状态与带电黑洞时空中移动的“世界末日麸皮”对立。麸皮的观察者至少在时空局部经历宇宙物理学和大约4维重力。