Muhammad Azzam Alwan, Tomohiro Inagaki, B. Mishra and S.A. Narawade
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引用次数: 0
摘要
假定恒星是静态和球对称的,具有完美的流体物质,我们使用现实的状态方程来研究协变f(Q)引力下的中子星。利用二次、指数和对数 f(Q) 模型,通过数值方法获得了中子星的结构剖面和性质,如质量、半径和紧密度。结果表明,如质量-半径关系图所示,非度量性会影响恒星的内部剖面偏差,进而影响恒星的性质。这种影响使得恒星可以容纳比 GR 更多或更少的物质,从而产生不同的总质量。对于二次模型,我们无法产生较大的质量,而其他两个模型则可以对观测到的较小质量和较大质量的恒星给出一致的结果。通过调整模型参数,我们得到的ℳ-ℛ图与 NICER 和 LIGO 的观测约束相一致。
Assuming static and spherically symmetric stars with perfect fluid matter, we used realistic equations of state to study neutron stars in covariant f(Q) gravity. The structure profiles and properties of neutron stars such as mass, radius and compactness are obtained through numerical methods using quadratic, exponential, and logarithmic f(Q) models. The results indicate that nonmetricity affects the interior profile deviations of the star, which in turn influence the properties of stars, as illustrated in the mass-radius relation diagram. This effect allows the star to accommodate either more or less matter compared to GR, resulting in a different total mass. For the quadratic model, we cannot generate larger masses, whereas the other two models can give consistent results for both smaller and larger masses of the observed stars. By tuning model parameters, we obtain ℳ-ℛ diagrams that are compatible with observational constraints from NICER and LIGO.
期刊介绍:
Journal of Cosmology and Astroparticle Physics (JCAP) encompasses theoretical, observational and experimental areas as well as computation and simulation. The journal covers the latest developments in the theory of all fundamental interactions and their cosmological implications (e.g. M-theory and cosmology, brane cosmology). JCAP''s coverage also includes topics such as formation, dynamics and clustering of galaxies, pre-galactic star formation, x-ray astronomy, radio astronomy, gravitational lensing, active galactic nuclei, intergalactic and interstellar matter.