Aspects of rotating anisotropic dark energy stars

IF 4.2 2区 物理与天体物理 Q2 PHYSICS, PARTICLES & FIELDS
O. P. Jyothilakshmi, Lakshmi J. Naik, V. Sreekanth
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Abstract

By employing modified Chaplygin fluid prescription for the dark energy, we construct slowly rotating isotropic and anisotropic dark energy stars. The slow rotation is incorporated via general relativistic Hartle–Thorne formalism; whereas the anisotropy is introduced through Bowers–Liang prescription. We consider both the monopole and quadrupole deformations and present a complete analysis of rotating dark energy stars. By numerically solving the rotating stellar structure equations in presence of anisotropy, we analyse and quantify various properties of dark energy stars such as mass (M), radius, mass deformation, angular momentum (J), moment of inertia, and quadrupole moment (Q), for three different equation of state parameters. We find that anisotropic slow rotation results in significant deformation of stellar mass and thereby affects other global properties studied. For the values of angular frequencies considered, the effect of anisotropy on the stellar structure is found to be more prominent than that due to rotation. The dimensionless quadrupole moment \(QM/J^2\) measuring deviation from a Kerr metric black hole was obtained for anisotropic dark energy stars. We observe that dark energy stars with higher anisotropic strength tend to approach the Kerr solution more closely. We report that our results have considerable agreement with various astrophysical observational measurements. We also find that the dimensionless quadrupole moments of anisotropic dark energy stars corresponding to the canonical mass \({\bar{q}}_{1.4}\) have a similar range of values as that of isotropic neutron stars and strange stars.

旋转各向异性暗能量恒星的各个方面
采用改进的Chaplygin暗能量流体处方,构造了慢旋转各向同性和各向异性暗能量恒星。慢旋转是通过广义相对论的哈特尔-索恩形式主义纳入的;而各向异性是通过鲍尔斯-梁处方引入的。我们考虑了单极和四极变形,并提出了旋转暗能量恒星的完整分析。通过数值求解存在各向异性的旋转恒星结构方程,我们分析和量化了暗能量恒星的各种性质,如质量(M)、半径、质量变形、角动量(J)、惯性矩和四极矩(Q),用于三种不同的状态参数方程。我们发现各向异性缓慢旋转导致恒星质量的显著变形,从而影响所研究的其他全局特性。对于考虑的角频率值,发现各向异性对恒星结构的影响比旋转的影响更突出。得到了各向异性暗能量星的无因次四极矩\(QM/J^2\)与克尔度量黑洞的测量偏差。我们观察到,具有较高各向异性强度的暗能量恒星倾向于更接近Kerr解。我们报告说,我们的结果与各种天体物理观测测量结果相当一致。我们还发现,各向异性暗能量恒星对应于规范质量\({\bar{q}}_{1.4}\)的无量纲四极矩与各向同性中子星和奇异星的四极矩具有相似的取值范围。
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来源期刊
The European Physical Journal C
The European Physical Journal C 物理-物理:粒子与场物理
CiteScore
8.10
自引率
15.90%
发文量
1008
审稿时长
2-4 weeks
期刊介绍: Experimental Physics I: Accelerator Based High-Energy Physics Hadron and lepton collider physics Lepton-nucleon scattering High-energy nuclear reactions Standard model precision tests Search for new physics beyond the standard model Heavy flavour physics Neutrino properties Particle detector developments Computational methods and analysis tools Experimental Physics II: Astroparticle Physics Dark matter searches High-energy cosmic rays Double beta decay Long baseline neutrino experiments Neutrino astronomy Axions and other weakly interacting light particles Gravitational waves and observational cosmology Particle detector developments Computational methods and analysis tools Theoretical Physics I: Phenomenology of the Standard Model and Beyond Electroweak interactions Quantum chromo dynamics Heavy quark physics and quark flavour mixing Neutrino physics Phenomenology of astro- and cosmoparticle physics Meson spectroscopy and non-perturbative QCD Low-energy effective field theories Lattice field theory High temperature QCD and heavy ion physics Phenomenology of supersymmetric extensions of the SM Phenomenology of non-supersymmetric extensions of the SM Model building and alternative models of electroweak symmetry breaking Flavour physics beyond the SM Computational algorithms and tools...etc.
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