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arXiv 1608.07971gr-qc
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圈量子引力的Hartle-Hawking态

Towards a Hartle-Hawking state for loop quantum gravity

Satya Dhandhukiya, Hanno Sahlmann

摘要:

Hartle-Hawking态是一种基于所有紧致欧氏四维几何上的路径积分的量子引力首选初始态的建议,其中四维几何以给定的三维几何为边界。这样构造的波函数在形式意义上满足ADM变量的广义相对论的(洛伦兹)哈密顿约束。在这篇文章中,我们模仿这个过程中构建的初始状态的Ashtekar-Barbero变量,并观察到,这样构建的波函数不满足洛伦兹哈密顿约束,即使在形式意义上。我们也研究了相对论粒子的这个问题。最后,我们提出了一个修改的建议,至少在形式意义上满足约束,并开始考虑其在量子宇宙学的影响。我们发现,对于某些变量,在鞍点近似下,该状态非常类似于圈量子引力的Ashtekar-Lewandowski状态。

英文摘要:

The Hartle-Hawking state is a proposal for a preferred initial state for quantum gravity, based on a path integral over all compact Euclidean four-geometries which have a given three-geometry as a boundary. The wave function constructed this way satisfies the (Lorentzian) Hamiltonian constraint of general relativity in ADM variables in a formal sense. In this article we mimic this procedure of constructing an initial state in terms of Ashtekar-Barbero variables, and observe that the wave function thus constructed does not satisfy the Lorentzian Hamiltonian constraint even in a formal sense. We also investigate this issue for the relativistic particle. We finally suggest a modification of the proposal that does satisfy the constraint at least in a formal sense and start to consider its implications in quantum cosmology. We find that for certain variables, and in the saddle point approximation, the state is very similar to the Ashtekar-Lewandowski state of loop quantum gravity.

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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