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Anisotropic extensions of isotropic Finch–Skea metric in the charged modified gravity 带电修正引力中各向同性芬奇-斯凯亚公设的各向异性扩展
IF 3.1 3区 物理与天体物理
Communications in Theoretical Physics Pub Date : 2024-07-23 DOI: 10.1088/1572-9494/ad58c3
Tayyab Naseer and M Sharif
{"title":"Anisotropic extensions of isotropic Finch–Skea metric in the charged modified gravity","authors":"Tayyab Naseer and M Sharif","doi":"10.1088/1572-9494/ad58c3","DOIUrl":"https://doi.org/10.1088/1572-9494/ad58c3","url":null,"abstract":"In this study, we explore the Finch–Skea perfect fluid solution and extend its domain to three distinct anisotropic interior models within the framework of the theory, incorporating the influence of an electromagnetic field. We assume a static spherical spacetime initially coupled with an isotropic matter distribution. We then introduce a Lagrangian corresponding to an additional gravitating source, taking into account its role in inducing pressure anisotropy within the original fluid source. By deriving the field equations for the combined matter setup, we applied a radial component transformation, which yielded two distinct systems of equations. In addition, we consider a charged exterior spacetime to determine the three constants associated with the Finch–Skea solution at the boundary. Our findings suggest that under certain parametric choices, all three resulting models exhibited physical relevance within this modified theory.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"1 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141785595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Massless Dirac perturbations of black holes in f(Q) gravity: quasinormal modes and a weak deflection angle f(Q)引力中黑洞的无质量狄拉克扰动：准正常模式和弱偏转角
IF 3.1 3区 物理与天体物理
Communications in Theoretical Physics Pub Date : 2024-07-18 DOI: 10.1088/1572-9494/ad51ee
Ahmad Al-Badawi and Sohan Kumar Jha
{"title":"Massless Dirac perturbations of black holes in f(Q) gravity: quasinormal modes and a weak deflection angle","authors":"Ahmad Al-Badawi and Sohan Kumar Jha","doi":"10.1088/1572-9494/ad51ee","DOIUrl":"https://doi.org/10.1088/1572-9494/ad51ee","url":null,"abstract":"This article considers a static and spherical black hole (BH) in f(Q) gravity. f(Q) gravity is the extension of symmetric teleparallel general relativity, where both curvature and torsion are vanishing and gravity is described by nonmetricity. In this study, we investigate the possible implications of quasinormal mode (QNM) modified Hawking spectra and deflection angles generated by the model. The Wentzel–Kramers–Brillouin method is used to solve the equations of motion for massless Dirac perturbation fields and explore the impact of the nonmetricity parameter (Q0). Based on the QNM computation, we can ensure that the BH is stable against massless Dirac perturbations and as Q0 increases the oscillatory frequency of the mode decreases. We then discuss the weak deflection angle in the weak field limit approximation. We compute the deflection angle up to the fourth order of approximation and show how the nonmetricity parameter affects it. We find that the Q0 parameter reduces the deflection angle.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"63 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141742984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Light axion-like particles and the pseudoscalar mesonic decays M⃗M′νν¯ 类轴子轻粒子和伪标量介子衰变 M⃗M′νν¯
IF 3.1 3区 物理与天体物理
Communications in Theoretical Physics Pub Date : 2024-07-16 DOI: 10.1088/1572-9494/ad5277
Guo-Qiang Dai, Chong-Xing Yue, Yang-Yang Bu and Yi-Hang Wang
{"title":"Light axion-like particles and the pseudoscalar mesonic decays M⃗M′νν¯","authors":"Guo-Qiang Dai, Chong-Xing Yue, Yang-Yang Bu and Yi-Hang Wang","doi":"10.1088/1572-9494/ad5277","DOIUrl":"https://doi.org/10.1088/1572-9494/ad5277","url":null,"abstract":"The axion-like particle (ALP) is one kind of the best-motivated new particles. We consider its production from the pseudoscalar mesonic decays , with M being a pseudoscalar meson B or K. The upper limits on the flavor-conserving ALP–quark coupling parameter gu are obtained by assuming the ALP to be an invisible particle. We find that the most severe constraint on gu comes from the decay for 0.05 GeV ≤ Ma ≤ 0.35 GeV, while the decays and can also generate significant constraints.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"27 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141721620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Constant-roll inflation with non-minimally derivative coupling 具有非微量导数耦合的恒定滚动膨胀
IF 3.1 3区 物理与天体物理
Communications in Theoretical Physics Pub Date : 2024-07-16 DOI: 10.1088/1572-9494/ad51ef
Jie Liu, Yungui Gong and Zhu Yi
{"title":"Constant-roll inflation with non-minimally derivative coupling","authors":"Jie Liu, Yungui Gong and Zhu Yi","doi":"10.1088/1572-9494/ad51ef","DOIUrl":"https://doi.org/10.1088/1572-9494/ad51ef","url":null,"abstract":"We investigate the constant-roll inflation with non-minimally kinetic coupling to the Einstein tensor. With the slow-roll parameter being a constant, we calculate the power spectra for scalar and tensor perturbations, and derive the expressions for the scalar spectral tilt ns, the tensor spectral tilt nT, and the tensor-to-scalar ratio r. We find that the expressions for ns are different with different ordering of taking the derivative of the scalar power spectrum with respect to the scale k and the horizon crossing condition csk = aH in the constant-roll inflation, the consistency relation r = − 8nT does not hold if ∣ηϕ∣ is not small, and the duality of the tensor-to-scalar ratio between the slow-roll inflation and ultra-slow-roll inflation does not exist in inflationary models with non-minimally derivative coupling. The result offers a fresh perspective on the understanding of the inflationary models with non-minimally derivative coupling and is helpful for the production of scalar induced gravitational waves in the framework of ultra-slow-roll inflation with non-minimally derivative coupling.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"309 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141721619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Efficient fidelity estimation: alternative derivation and related applications 高效保真度估算：替代推导及相关应用
IF 3.1 3区 物理与天体物理
Communications in Theoretical Physics Pub Date : 2024-07-16 DOI: 10.1088/1572-9494/ad5664
Diego S Starke, Marcos L W Basso and Jonas Maziero
{"title":"Efficient fidelity estimation: alternative derivation and related applications","authors":"Diego S Starke, Marcos L W Basso and Jonas Maziero","doi":"10.1088/1572-9494/ad5664","DOIUrl":"https://doi.org/10.1088/1572-9494/ad5664","url":null,"abstract":"In [Phys. Rev. A107 012427 (2023)], Baldwin and Jones prove that Uhlmann–Jozsa’s fidelity between two quantum states ρ and σ, i.e., , can be written in a simplified form as . In this article, we give an alternative proof of this result, using a function power series expansion and the properties of the trace function. Our approach not only reinforces the validity of the simplified expression but also facilitates the exploration of novel dissimilarity functions for quantum states and more complex trace functions of density operators.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"14 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141721621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Tidal effects based on a GUP-induced effective metric 基于 GUP 引起的有效度量的潮汐效应
IF 3.1 3区 物理与天体物理
Communications in Theoretical Physics Pub Date : 2024-07-16 DOI: 10.1088/1572-9494/ad51f0
Soon-Tae Hong, Yong-Wan Kim and Young-Jai Park
{"title":"Tidal effects based on a GUP-induced effective metric","authors":"Soon-Tae Hong, Yong-Wan Kim and Young-Jai Park","doi":"10.1088/1572-9494/ad51f0","DOIUrl":"https://doi.org/10.1088/1572-9494/ad51f0","url":null,"abstract":"In this paper, we study tidal forces in the Schwarzschild black hole, whose metric explicitly includes a generalized uncertainty principle (GUP) effect. We also investigate interesting features of the geodesic equations and tidal effects that are dependent on the GUP parameter α related to a minimum length. Then, by solving the geodesic deviation equations explicitly with appropriate boundary conditions, we show that α in the effective metric affects both the radial and angular components of the geodesic equation, particularly near the singularities.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"34 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141721625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Evolution of light deflection and shadow from a gauge-potential-like AdS black hole under the influence of a non-magnetic plasma medium 非磁等离子体介质影响下的规势样 AdS 黑洞的光偏转和光影演变
IF 3.1 3区 物理与天体物理
Communications in Theoretical Physics Pub Date : 2024-07-16 DOI: 10.1088/1572-9494/ad51f1
Riasat Ali, Xia Tiecheng, Muhammad Awais and Rimsha Babar
{"title":"Evolution of light deflection and shadow from a gauge-potential-like AdS black hole under the influence of a non-magnetic plasma medium","authors":"Riasat Ali, Xia Tiecheng, Muhammad Awais and Rimsha Babar","doi":"10.1088/1572-9494/ad51f1","DOIUrl":"https://doi.org/10.1088/1572-9494/ad51f1","url":null,"abstract":"We investigate the light deflection in the weak field approximation from the accelerating charged AdS black hole. For this purpose, we apply the Gauss–Bonnet theorem to calculate the light deflection in the weak field area and use the Gibbons–Werner approach to analyze the optical geometry of the accelerating charged AdS black hole in the non-magnetic plasma absence/presence of a non-magnetic medium. We also represent the graphical behavior of the light deflection angle w.r.t. the impact parameter. We also compute the light deflection angle using Keeton and Petters approximations under the impact of accelerating charged AdS black hole geometry. Furthermore, by using the ray-tracing approach, we determine the shadow in the non-magnetic plasma presence and also demonstrate that graphical shadow has an impact on the gauge potential, non-magnetic plasma frequencies and charge.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"38 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141721655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Slowly rotating charges from Weyl double copy for Kerr black hole with Chern–Simons correction 带有切尔-西蒙斯修正的克尔黑洞韦尔双副本慢旋转电荷
IF 3.1 3区 物理与天体物理
Communications in Theoretical Physics Pub Date : 2024-07-04 DOI: 10.1088/1572-9494/ad4a37
Yi-Ran Liu, Jing-Rui Zhang and Yun-Long Zhang
{"title":"Slowly rotating charges from Weyl double copy for Kerr black hole with Chern–Simons correction","authors":"Yi-Ran Liu, Jing-Rui Zhang and Yun-Long Zhang","doi":"10.1088/1572-9494/ad4a37","DOIUrl":"https://doi.org/10.1088/1572-9494/ad4a37","url":null,"abstract":"The Weyl double copy builds the relation between gauge theory and gravity theory, in particular the correspondence between gauge solutions and gravity solutions. In this paper, we obtain the slowly rotating charge solutions from the Weyl double copy for the Kerr black hole with small Chern–Simons correction. Based on the Weyl double copy relation, for the Petrov type D solution in Chern–Simons modified gravity, we find the additional correction to the electromagnetic field strength tensor of the rotating charge. For the Petrov type I solution, we find that the additional electromagnetic field strength tensors have external sources, while the total sources vanish at the leading order.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"22 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141549876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An approximate Kerr–Newman-like metric endowed with a magnetic dipole and mass quadrupole 具有磁偶极子和质量四极子的近似克尔-纽曼类方程
IF 3.1 3区 物理与天体物理
Communications in Theoretical Physics Pub Date : 2024-07-04 DOI: 10.1088/1572-9494/ad4cde
Francisco Frutos-Alfaro
{"title":"An approximate Kerr–Newman-like metric endowed with a magnetic dipole and mass quadrupole","authors":"Francisco Frutos-Alfaro","doi":"10.1088/1572-9494/ad4cde","DOIUrl":"https://doi.org/10.1088/1572-9494/ad4cde","url":null,"abstract":"Approximate all-terrain spacetimes for astrophysical applications are presented. The metrics possess five relativistic multipole moments, namely, mass, rotation, mass quadrupole, charge, and magnetic dipole moment. All these spacetimes approximately satisfy the Einstein–Maxwell field equations. The first metric is generated using the Hoenselaers–Perjés method from given relativistic multipoles. The second metric is a perturbation of the Kerr–Newman metric, which makes it a relevant approximation for astrophysical calculations. The last metric is an extension of the Hartle–Thorne metric that is important for obtaining internal models of compact objects perturbatively. The electromagnetic field is calculated using Cartan forms for locally non-rotating observers. These spacetimes are relevant for inferring properties of compact objects from astrophysical observations. Furthermore, the numerical implementations of these metrics are straightforward, making them versatile for simulating potential astrophysical applications.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"8 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141549878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Shell-model representations of the microscopic version of the Bohr–Mottelson collective model 玻尔-莫特森集体模型微观版本的壳模型表示法
IF 3.1 3区 物理与天体物理
Communications in Theoretical Physics Pub Date : 2024-07-04 DOI: 10.1088/1572-9494/ad4c56
H G Ganev
{"title":"Shell-model representations of the microscopic version of the Bohr–Mottelson collective model","authors":"H G Ganev","doi":"10.1088/1572-9494/ad4c56","DOIUrl":"https://doi.org/10.1088/1572-9494/ad4c56","url":null,"abstract":"The structure of the irreducible collective spaces of the group Sp(12, R), which many-particle nuclear states are classified according to the chain Sp(12, R) ⊃ U(6) ⊃ SO(6) ⊃ SUpn(3) ⨂ SO(2) ⊃ SO(3) of the proton–neutron symplectic model (PNSM), is considered in detail. This chain of the PNSM was recently shown to correspond to a microscopic shell-model version of the Bohr–Mottelson collective model. The construction of the relevant shell-model representations of the Sp(12, R) group along this chain is considered for three nuclei with varying collective properties and from different mass regions. It is shown that the SUpn(3) basis states of the Sp(12, R) representations belonging to the SO(6) irreps with seniority υ ≥ υ0, with υ0 denoting the maximal seniority SO(6) irrep contained in the Sp(12, R) bandhead, are always Pauli allowed, but organized in a different way into different SO(6) shells. This is in contrast to the case of filling the levels of the standard three-dimensional harmonic oscillator and using the plethysm operation. Although the SUpn(3) multiplets within υ < υ0 are not all Pauli forbidden, it is safe to discard them. The results obtained in the present work are important for the practical application of the microscopic version of the Bohr–Mottelson collective model.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"36 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141549877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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