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arXiv 2304.08092gr-qchep-th
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scalar-Gauss-Bonnet理论中球形奇异致密天体的非线性不稳定性与标量云

Nonlinear instability and scalar clouds of spherical exotic compact objects in scalar-Gauss-Bonnet theory

Shao-Jun Zhang

AI总结:

研究在scalar-Gauss-Bonnet理论中发现球对称无视界致密天体可因非线性不稳定性形成无限多类标量云,并揭示Dirichlet与Robin边界条件对其形成规律的不同影响。

摘要:

在这项工作中,我们提出了scalar-Gauss-Bonnet理论中由球对称无视界致密天体支撑的一类新型标量云。与此前由快子不稳定性触发的自发标量化不同,我们的标量化源于一种非自发的非线性不稳定性。我们考察了致密天体表面标量场的两类边界条件,并在两种情形下都发现了以节点数为特征的无限可数标量云集合。研究表明,边界条件对标量云的形成具有显著影响。具体而言,在Dirichlet边界条件下,中等半径的致密天体更易发生标量化,而超致密和大半径天体则更难;相反,在Robin边界条件下,天体越致密,标量化越容易。

英文摘要:

In this work, we present a new type of scalar clouds supported by spherically symmetric horizonless compact objects in the scalar-Gauss-Bonnet theory. Unlike the previous spontaneous scalarization that is triggered by the tachyonic instability, our scalarization arises from a nonlinear instability that is non-spontaneous. We explore two types of boundary conditions for the scalar field at the surface of the compact objects and find an infinite countable set of scalar clouds characterized by the number of nodes for both cases. Our study demonstrates that boundary conditions have a significant impact on the formation of scalar clouds. Specifically, for the Dirichlet boundary condition, scalarization is more likely to occur for compact objects with medium radii and becomes harder for ultra-compact and large ones. Conversely, for the Robin boundary condition, scalarization is easier for more compact objects.

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