The dimensionality of the Hilbert space of a Chern-Simons theory on a 3-fold, in the presence of Wilson lines carrying spin representations, had been counted by using its link with the Wess-Zumino theory, with level $k$, on the 2-sphere with points (to be called punctures) marked by the piercing of the corresponding Wilson lines and carrying the respective spin representations. It is shown, in the weak coupling (large $k$) limit, the formula decouples into two characteristically distinct parts; one mimics the dimensionality of the Hilbert space of a collection of non-interacting spin systems and the other is an effective overall correction contributed by all the punctures. The exact formula yield from this counting has been shown earlier to have resulted from the consideration of the punctures to be distinguishable. We investigate the same counting problem by considering the punctures to be indistinguishable. Although the full formula remains undiscovered, nonetheless, we are able to impose the relevant statistics for indistinguishable punctures in the approximate formula resulting from the weak coupling limit. As an implication of this counting, in the context of its relation to that of black hole entropy calculation in quantum geometric approach, we are able to show that the logarithmic area correction, with a coefficient of $-3/2$, that results in this method of entropy calculation, in independent of whether the punctures are distinguishable or not.
A Differentiable Parametric Model of Binary-Black-Hole Initial Data: I. Conformally flat Bowen-York punctures
KU Leuven（荷语鲁汶大学）；Institute for Theoretical Physics, KU Leuven（荷语鲁汶大学理论物理研究所）；Leuven Gravity Institute, KU Leuven（荷语鲁汶大学列日引力研究所）；STADIUS Center for Dynamical Systems, Signal Processing and Data Analytics, KU Leuven（荷语鲁汶大学STADIUS动力学系统、信号处理与数据分析中心）
Conformally curved initial data for charged, spinning black hole binaries on arbitrary orbits
提出了一种构造任意轨道上自旋带电黑洞双星共形弯曲初始数据的方法。我们推广了叠加的Kerr-Schild，扩展的共形薄夹层结构[Lovelace et al.，Phys. Rev. D {78}，084017（2008）]，以使用叠加黑洞的Kerr-Newman度量并求解电磁约束方程。我们在伪谱代码SGRID中实现了该构造。因此，与使用穿刺方法构建的现有带电黑洞初始数据相比，该代码提供了一种互补且完全独立的基于切除的构造[Bozzola and Paschaldom，Phys. Rev. D {99}，104044（2019）]。它还提供了Lovelace等人的真空构造的独立实现（有一些小的变化）。我们为不同构型的轨道双星构造初始数据，例如，对于高度带电或快速旋转的黑洞（对于这个初始测试，分别为极值的90%和80%，尽管代码应该能够使用更高的分辨率产生具有这些参数的更高值的数据），以及对于一般旋转的带电黑洞。我们进行了探索性的演化与有限差分，移动穿刺代码BAM（在真空的情况下）和HAD（头上的碰撞，包括收费），填充内切除表面。在带电的情况下，这些初始数据的演变提供了一个代理的二元黑洞波形在修改后的引力理论。此外，将这种结构推广到爱因斯坦-麦克斯韦-爱因斯坦理论应该是简单的。
