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arXiv 2010.01682gr-qcmath-phmath.MPmath.SP
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慢转Kerr黑洞MOTS稳定性算子的本征值

Eigenvalues of the MOTS stability operator for slowly rotating Kerr black holes

Liam Bussey, Graham Cox, Hari Kunduri

摘要:

研究了单位质量角动量为$|a| \ll M$的Kerr黑洞的MOTS稳定性算符的本征值。我们证明了每个特征值解析依赖于$a$(在附近的$a=0$),并计算其第一非零导数。回顾$a=0$对应于史瓦西解,其中每个特征值具有重数$2\ell+1$,我们发现对于非零的$a$,这种简并性完全被打破。特别地,对于$0 < |a| \ll M$,我们得到一个由$\ell$不同的复共轭对和一个实特征值组成的簇。作为我们结果的一个特例,我们得到了主特征值变化的一个简单公式。对于保持黑洞总面积或质量不变的扰动,我们发现主本征值在$a=0$有一个局部极大值。然而,也有其他的扰动,其主特征值在$a=0$具有局部最小值。

英文摘要:

We study the eigenvalues of the MOTS stability operator for the Kerr black hole with angular momentum per unit mass $|a| \ll M$. We prove that each eigenvalue depends analytically on $a$ (in a neighbourhood of $a=0$), and compute its first nonvanishing derivative. Recalling that $a=0$ corresponds to the Schwarzschild solution, where each eigenvalue has multiplicity $2\ell+1$, we find that this degeneracy is completely broken for nonzero $a$. In particular, for $0 < |a| \ll M$ we obtain a cluster consisting of $\ell$ distinct complex conjugate pairs and one real eigenvalue. As a special case of our results, we get a simple formula for the variation of the principal eigenvalue. For perturbations that preserve the total area or mass of the black hole, we find that the principal eigenvalue has a local maximum at $a=0$. However, there are other perturbations for which the principal eigenvalue has a local minimum at $a=0$.

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