Bibhash Das, Somi Aktar, Farook Rahaman, Bikash Chandra Paul
{"title":"具有各向异性的芬奇-斯基亚暗能量星","authors":"Bibhash Das, Somi Aktar, Farook Rahaman, Bikash Chandra Paul","doi":"10.1007/s10509-024-04341-3","DOIUrl":null,"url":null,"abstract":"<div><p>We present a relativistic model of anisotropic compact objects with spherically symmetric matter distribution coupled with dark energy in the framework of general theory of relativity. We assumed an ansatz for the dark energy (DE) equation of state (EoS) in addition to the baryonic matter. The interior spacetime of the compact object is described by the Finch-Skea (FS) metric and a causal domain of DE with a coupling parameter <span>\\(\\beta \\)</span>. The stellar model is employed to investigate physical features such as energy density, radial pressure, transverse pressure, anisotropy, mass-radius relation, EoS, etc. for a known pulsar, PSR J0348+0432 (<span>\\(M = 2.01 \\pm 0.04 M_{\\odot }\\)</span> and <span>\\(R = 12.072\\)</span> km) taking different <span>\\(\\beta \\)</span>. We test the stability of the stellar models for various values of <span>\\(\\beta \\)</span> in a relativistic stellar model. The EoS of the matter configuration inside the star is determined for different <span>\\(\\beta \\)</span> which are non-linear. The EoS obtained varying the DE coupling parameter (<span>\\(\\beta \\)</span>) indicates that the matter inside the DE star is more stiff for less <span>\\(\\beta \\)</span>. The prescription for obtaining a realistic stellar model is used to employ for other pulsars. The equation of states for those pulsars and the model parameters are determined for their observed masses and radii. The Mass-Radius (M-R) relation is independent of the coupling parameter <span>\\(\\beta \\)</span> and the M-R relation is consistent with the observational constraints.</p></div>","PeriodicalId":8644,"journal":{"name":"Astrophysics and Space Science","volume":"369 7","pages":""},"PeriodicalIF":1.8000,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Finch-Skea dark energy star with anisotropy\",\"authors\":\"Bibhash Das, Somi Aktar, Farook Rahaman, Bikash Chandra Paul\",\"doi\":\"10.1007/s10509-024-04341-3\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>We present a relativistic model of anisotropic compact objects with spherically symmetric matter distribution coupled with dark energy in the framework of general theory of relativity. We assumed an ansatz for the dark energy (DE) equation of state (EoS) in addition to the baryonic matter. The interior spacetime of the compact object is described by the Finch-Skea (FS) metric and a causal domain of DE with a coupling parameter <span>\\\\(\\\\beta \\\\)</span>. The stellar model is employed to investigate physical features such as energy density, radial pressure, transverse pressure, anisotropy, mass-radius relation, EoS, etc. for a known pulsar, PSR J0348+0432 (<span>\\\\(M = 2.01 \\\\pm 0.04 M_{\\\\odot }\\\\)</span> and <span>\\\\(R = 12.072\\\\)</span> km) taking different <span>\\\\(\\\\beta \\\\)</span>. We test the stability of the stellar models for various values of <span>\\\\(\\\\beta \\\\)</span> in a relativistic stellar model. The EoS of the matter configuration inside the star is determined for different <span>\\\\(\\\\beta \\\\)</span> which are non-linear. The EoS obtained varying the DE coupling parameter (<span>\\\\(\\\\beta \\\\)</span>) indicates that the matter inside the DE star is more stiff for less <span>\\\\(\\\\beta \\\\)</span>. The prescription for obtaining a realistic stellar model is used to employ for other pulsars. The equation of states for those pulsars and the model parameters are determined for their observed masses and radii. The Mass-Radius (M-R) relation is independent of the coupling parameter <span>\\\\(\\\\beta \\\\)</span> and the M-R relation is consistent with the observational constraints.</p></div>\",\"PeriodicalId\":8644,\"journal\":{\"name\":\"Astrophysics and Space Science\",\"volume\":\"369 7\",\"pages\":\"\"},\"PeriodicalIF\":1.8000,\"publicationDate\":\"2024-07-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Astrophysics and Space Science\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s10509-024-04341-3\",\"RegionNum\":4,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ASTRONOMY & ASTROPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Astrophysics and Space Science","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1007/s10509-024-04341-3","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
We present a relativistic model of anisotropic compact objects with spherically symmetric matter distribution coupled with dark energy in the framework of general theory of relativity. We assumed an ansatz for the dark energy (DE) equation of state (EoS) in addition to the baryonic matter. The interior spacetime of the compact object is described by the Finch-Skea (FS) metric and a causal domain of DE with a coupling parameter \(\beta \). The stellar model is employed to investigate physical features such as energy density, radial pressure, transverse pressure, anisotropy, mass-radius relation, EoS, etc. for a known pulsar, PSR J0348+0432 (\(M = 2.01 \pm 0.04 M_{\odot }\) and \(R = 12.072\) km) taking different \(\beta \). We test the stability of the stellar models for various values of \(\beta \) in a relativistic stellar model. The EoS of the matter configuration inside the star is determined for different \(\beta \) which are non-linear. The EoS obtained varying the DE coupling parameter (\(\beta \)) indicates that the matter inside the DE star is more stiff for less \(\beta \). The prescription for obtaining a realistic stellar model is used to employ for other pulsars. The equation of states for those pulsars and the model parameters are determined for their observed masses and radii. The Mass-Radius (M-R) relation is independent of the coupling parameter \(\beta \) and the M-R relation is consistent with the observational constraints.
期刊介绍:
Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered.
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