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arXiv 2012.13403gr-qcmath.QA
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模糊离散黑洞模型

Fuzzy and discrete black hole models

J. N. Argota-Quiroz, S. Majid

摘要:

使用量子黎曼几何,我们解决了一个Ricci=0静态球对称的解决方案在4D中,在每个$t,r$的$S^2$的非交换模糊球,找到一个维度跳跃的解决方案具有时间和径向形式的一个经典的5D Tangherlini黑洞。因此,即使是少量的角非对易性也会导致完全不同的径向行为,修改拉普拉斯算子和弱引力极限。我们同样提供了一个版本的三维黑洞与$S^1$在每个$t,r$现在是一个离散的圆$\Bbb Z_n$,与时间和径向形式的内部的经典四维史瓦西黑洞远离地平线。我们研究了拉普拉斯算子和经典极限$\Bbb Z_n\to S^1$。我们还研究了$\Bbb R\times S^2$上的三维FLRW模型,其中$S^2$是一个膨胀的模糊球,并且发现对于一个封闭的$\Bbb R\times S^3$宇宙,其膨胀的Friedmann方程是经典的四维方程.

英文摘要:

Using quantum Riemannian geometry, we solve for a Ricci=0 static spherically-symmetric solution in 4D, with the $S^2$ at each $t,r$ a noncommutative fuzzy sphere, finding a dimension jump with solutions having the time and radial form of a classical 5D Tangherlini black hole. Thus, even a small amount of angular noncommutativity leads to radically different radial behaviour, modifying the Laplacian and the weak gravity limit. We likewise provide a version of a 3D black hole with the $S^1$ at each $t,r$ now a discrete circle $\Bbb Z_n$, with the time and radial form of the inside of a classical 4D Schwarzschild black hole far from the horizon. We study the Laplacian and the classical limit $\Bbb Z_n\to S^1$. We also study the 3D FLRW model on $\Bbb R\times S^2$ with $S^2$ an expanding fuzzy sphere and find that the Friedmann equation for the expansion is the classical 4D one for a closed $\Bbb R\times S^3$ universe.

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