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arXiv 0907.2570gr-qc
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五维时空中的黑天体与Hoop猜想

Black Objects and Hoop Conjecture in Five-dimensional Space-time

Yuta Yamada, Hisa-aki Shinkai

摘要:

在宇宙监督猜想的背景下,数值研究了五维时空中薄纺锤体和薄圆环的初始数据序列。在瞬时静态假设下,我们将物质模拟为非旋转的均匀球或环结构,求解了哈密顿约束方程,并搜索了视视界。我们讨论了$S^3$(黑洞)或$S^1 \times S^2$(黑环)视界(“黑物体”)何时形成。通过监测最大Kretchmann不变量的位置,提出了在特殊情况下出现“裸奇点”或“裸环”的可能性。我们还利用物体周围的最小{ \it面积}讨论了{ \it超环}猜想的有效性,并表明环视界的出现与该环不匹配。

英文摘要:

We numerically investigated the sequences of initial data of thin spindle and thin ring in five-dimensional space-time in the context of the cosmic censorship conjecture. We modeled the matter in non-rotating homogeneous spheroidal or toroidal configurations under the momentarily static assumption, solved the Hamiltonian constraint equation, and searched the apparent horizons. We discussed when $S^3$ (black hole) or $S^1 \times S^2$ (black ring) horizons ("black objects") are formed. By monitoring the location of the maximum Kretchmann invariant, an appearance of `naked singularity' or `naked ring' under special situation is suggested. We also discuss the validity of the {\it hyper-hoop} conjecture using minimum {\it area} around the object, and show that the appearance of the ring horizon does not match with this hoop.

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