Crunches，Hats，and a Conjecture（英语：Crunches，Hats and a Conjecture）
Crunches, Hats, and a Conjecture
摘要：
本文的目的是讨论宇宙学精确对偶描述存在的判据。对于平坦和反德西特背景，以及可能在永恒膨胀背景中成核的开放FRW宇宙，存在许多精确的描述。此外，对于deSitter空间和具有负宇宙学常数的FRW泡，也有人提出了相应的理论。在后一种情况下，我们有理由认为二元性充其量只是近似的。我们的主要目的之一是分析这些描述的质量，即，精确到什么程度Maldacena最近对包含FRW宇宙学的对偶性的讨论为探索其中一些问题提供了机会。
英文摘要：
Our purpose in this paper is to discuss criteria for the existence of a precise dual description of a cosmology. A number of exact descriptions exist for flat and anti de Sitter backgrounds and possibly for open FRW universes that nucleate in an eternally inflating background. In addition duals have been proposed for de Sitter space, and for crunching FRW bubbles with negative cosmological constant. In the latter cases there is reason to think the dualities are at best approximate. One of our primary purposes is to analyze the quality of these descriptions, i.e., how exact they can be made. Maldacena's recent discussion of dualities involving crunching FRW cosmologies provides an opportunity for exploring some of these question.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
