{"title":"从杰尼斯-纽曼-维尼库尔裸奇点到爱因斯坦-麦克斯韦尔幽灵虫洞","authors":"Changjun Gao, Jianhui Qiu","doi":"10.3390/universe10080328","DOIUrl":null,"url":null,"abstract":"The Janis–Newman–Winicour spacetime corresponds to a static spherically symmetric solution of Einstein equations with the energy momentum tensor of a massless quintessence field. It is understood that the spacetime describes a naked singularity. The solution has two parameters, b and s. To our knowledge, the exact physical meaning of the two parameters is still unclear. In this paper, starting from the Janis–Newman–Winicour naked singularity solution, we first obtain a wormhole solution by a complex transformation. Then, letting the parameter s approach infinity, we obtain the well-known exponential wormhole solution. After that, we embed both the Janis–Newman–Winicour naked singularity and its wormhole counterpart in the background of a de Sitter or anti-de Sitter universe with the energy momentum tensor of massive quintessence and massive phantom fields, respectively. To our surprise, the resulting quintessence potential is actually the dilaton potential found by one of us. It indicates that, by modulating the parameters in the charged dilaton black hole solutions, we can obtain the Janis–Newman–Winicour solution. Furthermore, a charged wormhole solution is obtained by performing a complex transformation on the charged dilaton black hole solutions in the background of a de Sitter or anti-de Sitter universe. We eventually find that s is actually related to the coupling constant of the dilaton field to the Maxwell field and b is related to a negative mass for the dilaton black holes. A negative black hole mass is physically forbidden. Therefore, we conclude that the Janis–Newman–Winicour naked singularity solution is not physically allowed.","PeriodicalId":48646,"journal":{"name":"Universe","volume":"58 1","pages":""},"PeriodicalIF":2.5000,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"From the Janis–Newman–Winicour Naked Singularities to the Einstein–Maxwell Phantom Wormholes\",\"authors\":\"Changjun Gao, Jianhui Qiu\",\"doi\":\"10.3390/universe10080328\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The Janis–Newman–Winicour spacetime corresponds to a static spherically symmetric solution of Einstein equations with the energy momentum tensor of a massless quintessence field. It is understood that the spacetime describes a naked singularity. The solution has two parameters, b and s. To our knowledge, the exact physical meaning of the two parameters is still unclear. In this paper, starting from the Janis–Newman–Winicour naked singularity solution, we first obtain a wormhole solution by a complex transformation. Then, letting the parameter s approach infinity, we obtain the well-known exponential wormhole solution. After that, we embed both the Janis–Newman–Winicour naked singularity and its wormhole counterpart in the background of a de Sitter or anti-de Sitter universe with the energy momentum tensor of massive quintessence and massive phantom fields, respectively. To our surprise, the resulting quintessence potential is actually the dilaton potential found by one of us. It indicates that, by modulating the parameters in the charged dilaton black hole solutions, we can obtain the Janis–Newman–Winicour solution. Furthermore, a charged wormhole solution is obtained by performing a complex transformation on the charged dilaton black hole solutions in the background of a de Sitter or anti-de Sitter universe. We eventually find that s is actually related to the coupling constant of the dilaton field to the Maxwell field and b is related to a negative mass for the dilaton black holes. A negative black hole mass is physically forbidden. 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引用次数: 0
摘要
杰尼斯-纽曼-维尼库尔时空对应于爱因斯坦方程的静态球对称解,其能量动量张量为无质量五元场。据了解,该时空描述了一个裸奇点。据我们所知,这两个参数的确切物理含义尚不清楚。本文从 Janis-Newman-Winicour 裸奇点解出发,首先通过复变得到虫洞解。然后,让参数 s 接近无穷大,我们得到了著名的指数虫洞解。之后,我们将杰尼斯-纽曼-维尼柯裸奇点及其虫洞对应方案分别嵌入到具有大质量五元场和大质量幻象场的能量动量张量的德西特宇宙或反德西特宇宙背景中。令我们惊讶的是,所得到的五元势实际上就是我们中的一个人发现的稀拉顿势。这表明,通过调节带电稀拉顿黑洞解的参数,我们可以得到杰尼斯-纽曼-维尼库尔解。此外,在德西特或反德西特宇宙背景下,通过对带电稀拉顿黑洞解进行复杂变换,可以得到带电虫洞解。我们最终发现,s 实际上与稀拉顿场与麦克斯韦场的耦合常数有关,而 b 则与稀拉顿黑洞的负质量有关。负的黑洞质量在物理上是被禁止的。因此,我们得出结论:物理上不允许出现杰尼斯-纽曼-维尼库尔裸奇点解。
From the Janis–Newman–Winicour Naked Singularities to the Einstein–Maxwell Phantom Wormholes
The Janis–Newman–Winicour spacetime corresponds to a static spherically symmetric solution of Einstein equations with the energy momentum tensor of a massless quintessence field. It is understood that the spacetime describes a naked singularity. The solution has two parameters, b and s. To our knowledge, the exact physical meaning of the two parameters is still unclear. In this paper, starting from the Janis–Newman–Winicour naked singularity solution, we first obtain a wormhole solution by a complex transformation. Then, letting the parameter s approach infinity, we obtain the well-known exponential wormhole solution. After that, we embed both the Janis–Newman–Winicour naked singularity and its wormhole counterpart in the background of a de Sitter or anti-de Sitter universe with the energy momentum tensor of massive quintessence and massive phantom fields, respectively. To our surprise, the resulting quintessence potential is actually the dilaton potential found by one of us. It indicates that, by modulating the parameters in the charged dilaton black hole solutions, we can obtain the Janis–Newman–Winicour solution. Furthermore, a charged wormhole solution is obtained by performing a complex transformation on the charged dilaton black hole solutions in the background of a de Sitter or anti-de Sitter universe. We eventually find that s is actually related to the coupling constant of the dilaton field to the Maxwell field and b is related to a negative mass for the dilaton black holes. A negative black hole mass is physically forbidden. Therefore, we conclude that the Janis–Newman–Winicour naked singularity solution is not physically allowed.
UniversePhysics and Astronomy-General Physics and Astronomy
CiteScore
4.30
自引率
17.20%
发文量
562
审稿时长
24.38 days
期刊介绍:
Universe (ISSN 2218-1997) is an international peer-reviewed open access journal focused on fundamental principles in physics. It publishes reviews, research papers, communications, conference reports and short notes. Our aim is to encourage scientists to publish their research results in as much detail as possible. There is no restriction on the length of the papers.