加拿大英属哥伦比亚大学Abhisek Sahu团队研究了全息黑洞宇宙论。这一研究成果于2025年5月28日发表在《高能物理杂志》上。

研究组描述并研究了大爆炸/大紧缩宇宙时空的全息构造，其中物质由黑洞晶格组成。宇宙时空是双重的，是与黑洞第二渐近区域相关的全息CFT集合的纠缠态。对于具有空间切片几何∑的宇宙学，该状态是通过CFT的欧几里德路径积分在通过管晶格连接∑的两个副本获得的几何上构建的。 

在三维引力中，他们明确地描述了宇宙学解和相关的欧几里德鞍。对于（全局）平坦宇宙学的情况，确定了与宇宙学相关的欧几里德解何时提供了与保持边界空间对称性的其他自然候选者相比的主导鞍。研究组发现，当黑洞足够大且靠近时，宇宙鞍占主导地位。

附：英文原文

Title: Holographic black hole cosmologies

Author: Sahu, Abhisek, Van Raamsdonk, Mark

Issue&Volume: 2025-05-28

Abstract: We describe and study a holographic construction of big-bang / big-crunch cosmological spacetimes where the matter consists of a lattice of black holes. The cosmological spacetime is dual to an entangled state of a collection of holographic CFTs associated with the second asymptotic regions of the black holes. For a cosmology with spatial slice geometry Σ, this state is constructed via a Euclidean path integral for the CFT on a geometry obtained by connecting two copies of Σ by a lattice of tubes. In three-dimensional gravity, we describe the cosmological solutions and the associated Euclidean saddles explicitly. For the case of (globally) flat cosmology, we determine when the Euclidean solution associated with the cosmology provides the dominant saddle compared to other natural candidates that preserve the symmetries of the boundary space. We find that the cosmological saddle dominates when the black holes are sufficiently large and close together.

DOI: 10.1007/JHEP05(2025)233

Source: https://link.springer.com/article/10.1007/JHEP05(2025)233