arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.13756gr-qc
收藏

关于史瓦西问题的离散形式

On the discrete version of the Schwarzschild problem

V. M. Khatsymovsky

摘要:

我们考虑了在路径积分方法内量子化的广义相对论的离散Regge演算公式中的Schwarzschild型解。早些时候,我们发现了一个机制,一个松散的固定的背景规模的雷奇长度。这个基本长度尺度是由普朗克尺度和这个理论的量子扩展的一些自由参数定义的。此外,Regge作用量被简化为对四面体之间的度量变化的展开,并且在主要近似下是希尔伯特-爱因斯坦作用量的有限差分形式。利用Schwarzschild问题的先验一般非球对称解,得到了其离散形式的有限差分方程。这定义了一个解决方案,在大的距离是接近连续史瓦西几何,和度量和有效曲率在中心被切断的基本长度尺度。也可以考虑慢旋转(Lense-Thirring类度量)。因此,我们得到了一个通用的方法在量子框架中的经典背景在零级:这是一个最佳的出发点的微扰展开的理论;有限差分方程是经典的,基本长度尺度有量子起源。如果存在奇点,则解决。

英文摘要:

We consider a Schwarzschild type solution in the discrete Regge calculus formulation of general relativity quantized within the path integral approach. Earlier, we found a mechanism of a loose fixation of the background scale of Regge lengths. This elementary length scale is defined by the Planck scale and some free parameter of such a quantum extension of the theory. Besides, Regge action was reduced to an expansion over metric variations between the tetrahedra and, in the main approximation, is a finite-difference form of the Hilbert-Einstein action. Using for the Schwarzschild problem a priori general non-spherically symmetrical ansatz, we get finite-difference equations for its discrete version. This defines a solution which at large distances is close to the continuum Schwarzschild geometry, and the metric and effective curvature at the center are cut off at the elementary length scale. Slow rotation can also be taken into account (Lense-Thirring-like metric). Thus we get a general approach to the classical background in the quantum framework in zero order: it is an optimal starting point for the perturbative expansion of the theory; finite-difference equations are classical, the elementary length scale has quantum origin. Singularities, if any, are resolved.

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。

↑