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arXiv 2409.14218hep-thgr-qc
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无边界密度矩阵

The no boundary density matrix

Victor Ivo, Yue-Zhou Li, Juan Maldacena

AI总结:

本文提出宇宙子区域的无边界密度矩阵,通过对 Hartle-Hawking 波函数中未观测区域求迹得到处方并计算具体几何,同时将 Coleman de Luccia 泡解释为唯象可接受的局部概率极大贡献。

摘要:

我们讨论了宇宙一个子区域的无边界提议。在经典近似中,该密度矩阵涉及寻找运动方程的一个特定无边界经典解。除了通常的早期无边界条件外,在我们求迹消去的区域中还存在另一个无边界条件。我们可以从完整切片上波函数的通常 Hartle-Hawking 提议出发,在经典近似中对未观测区域求迹,从而得到这一处方。我们讨论了若干特定子区域并计算了相应解。正如预期,这些几何给出的概率在唯象上不可接受。我们还讨论了通常的 Coleman de Luccia 泡解如何可被解释为对宇宙密度矩阵的一种可能无边界贡献。这些几何给出概率的局部(而非全局)极大值,且在唯象上可接受。

英文摘要:

We discuss a no-boundary proposal for a subregion of the universe. In the classical approximation, this density matrix involves finding a specific classical solution of the equations of motion with no boundary. Beyond the usual no boundary condition at early times, we also have another no boundary condition in the region we trace out. We can find the prescription by starting from the usual Hartle-Hawking proposal for the wavefunction on a full slice and tracing out the unobserved region in the classical approximation. We discuss some specific subregions and compute the corresponding solutions. These geometries lead to phenomenologically unacceptable probabilities, as expected. We also discuss how the usual Coleman de Luccia bubble solutions can be interpreted as a possible no boundary contribution to the density matrix of the universe. These geometries lead to local (but not global) maxima of the probability that are phenomenologically acceptable.

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。

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