{"title":"托尔曼-库霍维茨时空中 f(R,T) 修正引力下的孤立紧凑星 RXJ1856.5 - 3754","authors":"Mayukh Bandyopadhyay , Ritabrata Biswas","doi":"10.1016/j.physleta.2024.129676","DOIUrl":null,"url":null,"abstract":"<div><p>Our main motive is to model and study the mass-radius relation of the specific isolated compact star <span><math><mi>R</mi><mi>X</mi><mi>J</mi><mn>1856.5</mn><mo>−</mo><mn>3754</mn></math></span> in the background of the late time accelerated Universe and to achieve the equation of state of the core matter under stable equilibrium in <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><mi>T</mi><mo>)</mo></math></span> modified gravity using Tolman-Kuchowicz metric potentials. Einstein-Hilbert action is taken as <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><mi>T</mi><mo>)</mo><mo>=</mo><mi>R</mi><mo>+</mo><mn>2</mn><mi>ξ</mi><mi>T</mi></math></span>, where <em>R</em> and <em>T</em> are the Ricci scalar and the trace of energy-momentum tensor respectively and <em>ξ</em> as coupling parameter. Modified Tolman-Oppenheimer-Volkoff equations are numerically solved by considering the presence of modified Chaplygin gas inside the star and also solving the corresponding field equations. We have got an explicit scenario of the structural evolution of isolated neutron stars through accelerating spacetime. Interestingly, all the derived outcomes of this investigation have become compatible with physically adopted regimes which reveal the physical viability of this current model.</p></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":null,"pages":null},"PeriodicalIF":2.3000,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Isolated compact star RXJ1856.5 − 3754 in f(R,T) modified gravity in Tolman-Kuchowicz spacetime\",\"authors\":\"Mayukh Bandyopadhyay , Ritabrata Biswas\",\"doi\":\"10.1016/j.physleta.2024.129676\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Our main motive is to model and study the mass-radius relation of the specific isolated compact star <span><math><mi>R</mi><mi>X</mi><mi>J</mi><mn>1856.5</mn><mo>−</mo><mn>3754</mn></math></span> in the background of the late time accelerated Universe and to achieve the equation of state of the core matter under stable equilibrium in <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><mi>T</mi><mo>)</mo></math></span> modified gravity using Tolman-Kuchowicz metric potentials. Einstein-Hilbert action is taken as <span><math><mi>f</mi><mo>(</mo><mi>R</mi><mo>,</mo><mi>T</mi><mo>)</mo><mo>=</mo><mi>R</mi><mo>+</mo><mn>2</mn><mi>ξ</mi><mi>T</mi></math></span>, where <em>R</em> and <em>T</em> are the Ricci scalar and the trace of energy-momentum tensor respectively and <em>ξ</em> as coupling parameter. Modified Tolman-Oppenheimer-Volkoff equations are numerically solved by considering the presence of modified Chaplygin gas inside the star and also solving the corresponding field equations. We have got an explicit scenario of the structural evolution of isolated neutron stars through accelerating spacetime. Interestingly, all the derived outcomes of this investigation have become compatible with physically adopted regimes which reveal the physical viability of this current model.</p></div>\",\"PeriodicalId\":20172,\"journal\":{\"name\":\"Physics Letters A\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.3000,\"publicationDate\":\"2024-07-08\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Physics Letters A\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0375960124003700\",\"RegionNum\":3,\"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":"Physics Letters A","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0375960124003700","RegionNum":3,"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
我们的主要动机是利用托尔曼-库霍维奇（Tolman-Kuchowicz）度势，模拟和研究时间加速晚期宇宙背景下特定孤立紧凑星 RXJ1856.5-3754 的质量-半径关系，并在 f(R,T) 修正引力下实现核心物质稳定平衡的状态方程。爱因斯坦-希尔伯特作用为 f(R,T)=R+2ξT，其中 R 和 T 分别为里奇标量和能动张量迹，ξ 为耦合参数。考虑到恒星内部存在修正的查普利金气体，对修正的托尔曼-奥本海默-沃尔科夫方程进行了数值求解，同时求解了相应的场方程。通过加速时空，我们得到了孤立中子星结构演化的明确情景。有趣的是，这项研究的所有推导结果都与物理上采用的制度相兼容，这揭示了当前模型的物理可行性。
Isolated compact star RXJ1856.5 − 3754 in f(R,T) modified gravity in Tolman-Kuchowicz spacetime
Our main motive is to model and study the mass-radius relation of the specific isolated compact star in the background of the late time accelerated Universe and to achieve the equation of state of the core matter under stable equilibrium in modified gravity using Tolman-Kuchowicz metric potentials. Einstein-Hilbert action is taken as , where R and T are the Ricci scalar and the trace of energy-momentum tensor respectively and ξ as coupling parameter. Modified Tolman-Oppenheimer-Volkoff equations are numerically solved by considering the presence of modified Chaplygin gas inside the star and also solving the corresponding field equations. We have got an explicit scenario of the structural evolution of isolated neutron stars through accelerating spacetime. Interestingly, all the derived outcomes of this investigation have become compatible with physically adopted regimes which reveal the physical viability of this current model.
期刊介绍：
Physics Letters A offers an exciting publication outlet for novel and frontier physics. It encourages the submission of new research on: condensed matter physics, theoretical physics, nonlinear science, statistical physics, mathematical and computational physics, general and cross-disciplinary physics (including foundations), atomic, molecular and cluster physics, plasma and fluid physics, optical physics, biological physics and nanoscience. No articles on High Energy and Nuclear Physics are published in Physics Letters A. The journal''s high standard and wide dissemination ensures a broad readership amongst the physics community. Rapid publication times and flexible length restrictions give Physics Letters A the edge over other journals in the field.
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