布兰斯-迪克理论中的球对称粘性宇宙论

IF 1.9 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Pramana Pub Date : 2023-02-06 DOI:10.1007/s12043-022-02495-9

S P Hatkar, G D Karhale, S D Katore

{"title":"布兰斯-迪克理论中的球对称粘性宇宙论","authors":"S P Hatkar, G D Karhale, S D Katore","doi":"10.1007/s12043-022-02495-9","DOIUrl":null,"url":null,"abstract":"<div><p>In the present paper, we investigated spherically symmetric space–time for bulk viscosity in the context of Brans–Dicke theory (BBT) of gravitation. It is observed that the Universe is accelerating for small values of expansion scalar and decelerating for large values of expansion scalar. The coefficient of bulk viscosity is negative, the wormhole is compact in Case I whereas in Case II, it is proportional to energy density and positive and the wormhole is non-compact. The required conditions for the wormhole are satisfied.</p></div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"97 1","pages":""},"PeriodicalIF":1.9000,"publicationDate":"2023-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12043-022-02495-9.pdf","citationCount":"0","resultStr":"{\"title\":\"Spherically symmetric viscous cosmology in Brans–Dicke theory\",\"authors\":\"S P Hatkar, G D Karhale, S D Katore\",\"doi\":\"10.1007/s12043-022-02495-9\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>In the present paper, we investigated spherically symmetric space–time for bulk viscosity in the context of Brans–Dicke theory (BBT) of gravitation. It is observed that the Universe is accelerating for small values of expansion scalar and decelerating for large values of expansion scalar. The coefficient of bulk viscosity is negative, the wormhole is compact in Case I whereas in Case II, it is proportional to energy density and positive and the wormhole is non-compact. The required conditions for the wormhole are satisfied.</p></div>\",\"PeriodicalId\":743,\"journal\":{\"name\":\"Pramana\",\"volume\":\"97 1\",\"pages\":\"\"},\"PeriodicalIF\":1.9000,\"publicationDate\":\"2023-02-06\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://link.springer.com/content/pdf/10.1007/s12043-022-02495-9.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Pramana\",\"FirstCategoryId\":\"4\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s12043-022-02495-9\",\"RegionNum\":4,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"PHYSICS, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Pramana","FirstCategoryId":"4","ListUrlMain":"https://link.springer.com/article/10.1007/s12043-022-02495-9","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

摘要

在本文中，我们在引力的Brans-Dicke理论(BBT)的背景下研究了体粘度的球对称时空。我们观察到，当膨胀标量值较小时，宇宙在加速，当膨胀标量值较大时，宇宙在减速。体积黏度系数为负，在情形一虫孔致密，而在情形二虫孔体积黏度系数与能量密度成正比，为正，虫孔不致密。虫洞的条件已满足。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

查看原文本刊更多论文

Spherically symmetric viscous cosmology in Brans–Dicke theory

In the present paper, we investigated spherically symmetric space–time for bulk viscosity in the context of Brans–Dicke theory (BBT) of gravitation. It is observed that the Universe is accelerating for small values of expansion scalar and decelerating for large values of expansion scalar. The coefficient of bulk viscosity is negative, the wormhole is compact in Case I whereas in Case II, it is proportional to energy density and positive and the wormhole is non-compact. The required conditions for the wormhole are satisfied.

求助全文

通过发布文献求助，成功后即可免费获取论文全文。去求助

来源期刊

Pramana 物理-物理：综合

CiteScore

3.60

自引率

7.10%

发文量

206

审稿时长

3 months

期刊介绍： Pramana - Journal of Physics is a monthly research journal in English published by the Indian Academy of Sciences in collaboration with Indian National Science Academy and Indian Physics Association. The journal publishes refereed papers covering current research in Physics, both original contributions - research papers, brief reports or rapid communications - and invited reviews. Pramana also publishes special issues devoted to advances in specific areas of Physics and proceedings of select high quality conferences.