Overcharging nonlinear electrodynamic black holes at linear order and the weak cosmic censorship conjecture
Overcharging nonlinear electrodynamic black holes at linear order and the weak cosmic censorship conjecture
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DOI：
10.1103/physrevd.101.124067
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发表时间：
2020-03
影响因子：
5
通讯作者：
Chengcheng Liu;Sijie Gao
中科院分区：
文献类型：
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作者：
Chengcheng Liu;Sijie Gao
已经发现的证据表明，如果将带电荷和角动量的测试粒子注入黑洞，弱宇宙审查猜想可能被打破。然而，在以往的研究中，需要对粒子的参数进行二阶修正和微调，这表明必须考虑自作用力和辐射效应。在本文中，我们首先考虑一个磁性带电粒子落入一个极巴丁黑洞，它是规则的（没有奇点），在中心有一个磁单极子。然后我们研究了一类与非线性电动力学相关的磁性黑洞。在所有情况下，我们都证明了具有磁荷的测试粒子可能会对黑洞进行过充电，从而可能违反弱宇宙审查猜想。我们还发现，每一个与磁场相关的球对称时空也可以由电场产生。此外，如果一个带磁性电荷的黑洞可以被过充电，那么包含一个带电黑洞的相同时空也可以被过充电。虽然以前的文献中已经构建了弱宇宙审查的可能反例，这些反例总是涉及粒子参数中的高阶项，但我们第一次发现线性项足以构成反例。
Evidences have been found that the weak cosmic censorship conjecture could be violated if test particles with charge and angular momentum are injected into a black hole. However, second-order corrections and fine-tunings on the particle's parameters are required in previous studies, indicating that self-force and radiative effects must be taken into account. In this paper, we first consider a magnetically charged particle falling into an extremal Bardeen black hole, which is regular (with no singularity) and has a magnetic monopole at the center. We then investigate a general class of magnetic black holes associated with nonlinear electrodynamics. In all the cases, we show that the test particle with magnetic charge could overcharge the black hole, causing possible violation of the weak cosmic censorship conjecture. We also find that every spherically symmetric spacetime associated with a magnetic field can also be generated by an electric field. Moreover, if a magnetically charged black hole can be overcharged, the same spacetime containing an electrically charged black hole can also be overcharged. Although possible counterexamples to the weak cosmic censorship have been constructed previously in the literature, which always involved higher-order terms in particles' parameters, we find, for the first time, that linear terms are enough to make counterexamples.