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arXiv 2212.04544gr-qc
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任意静态、球对称时空作为标量-张量引力的解

Arbitrary static, spherically symmetric space-times as solutions of scalar-tensor gravity

Kirill A. Bronnikov, Kodir Badalov, Rustam Ibadov

AI总结:

本文证明任意静态球对称度规可表示为标量-张量引力理论的精确解,标量场可分段改变性质,并给出两个示例。

摘要:

研究表明,任意静态、球对称度规可以表示为具有特定非最小耦合函数 $f(ϕ)$ 和势 $U(ϕ)$ 的标量-张量引力理论(STT)的精确解。在这种表示中,标量场在某些坐标球面上可以从典型(canonical)性质转变为幻影(phantom)性质。然而,这种表示通常并非在整个径向坐标范围内有效,而仅分段有效。本文讨论了STT表示的两个示例:一个是Reissner-Nordström度规,另一个是Simpson-Visser对Schwarzschild度规的正则化(即所谓的黑洞弹跳时空)。

英文摘要:

It is shown that an arbitrary static, spherically symmetric metric can be presented as an exact solution of a scalar-tensor theory (STT) of gravity with certain nonminimal coupling function $f(ϕ)$ and potential $U(ϕ)$. The scalar field in this representation can change its nature from canonical to phantom on certain coordinate spheres. This representation, however, is valid in general not in the full range of the radial coordinate but only piecewise. Two examples of STT representations are discussed: for the Reissner-Nordström metric and for the Simpson-Visser regularization of the Schwarzschild metric (the so-called black bounce space-time).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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