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arXiv 2412.01201nucl-th
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探索$\Delta$-同位旋对中子星的影响

Exploring the impact of $Δ$-isobars on Neutron Star

Rashmita Jena, S. K. Biswal, Padmalaya Dash, R. N. Panda, M. Bhuyan

AI总结:

本文在RMF状态方程中引入$\Delta$-同位旋,利用21组参数对比脉冲星与GW170817约束,并以NLD为代表分析耦合常数对中子星质量、半径和潮汐可变形性的影响。

摘要:

我们将$\Delta$-同位旋纳入中子星(NS)的状态方程(EOS),并使用RMF模型的多种参数集研究其效应。我们将结果与来自PSR J0348+0432、PSR J1614-2234、PSR J0030+0451、PSR J0740+6620、PSR J0952-0607的质量-半径测量以及GW170817的潮汐可变形性对中子星的约束进行了比较。我们使用RMF模型的21个参数集计算了中子星的质量-半径分布和潮汐可变形性。通过分析不同参数下的结果可以明显看出,只有少数参数集能够同时满足NICER和GW170817的约束。NLD参数集满足NICER和GW170817的所有约束。由于其对中子星整体性质具有很强的预测能力,我们将NLD参数集作为代表,详细计算$\Delta$-同位旋对中子星性质的影响。我们证明,通过在适当范围内调节耦合常数$X_{\sigma\Delta}$、$X_{\rho\Delta}$和$X_{\omega\Delta}$,$\Delta$-同位旋有可能在2至3倍饱和密度处产生。中子星的质量-半径分布和潮汐可变形性等整体性质受到$\Delta$-同位旋相互作用强度的强烈影响。我们的计算表明,通过将$X_{\sigma\Delta}$、$X_{\rho\Delta}$和$X_{\omega\Delta}$选择在合适范围内,$\Delta^-$-同位旋的阈值密度也有可能低于$\Lambda^0$超子。对于一组特定的$\Delta$耦合常数取值,$R_{1.4}$减小1.7公里。本手稿为在中子星性质计算中允许引入$\Delta$-同位旋自由度提供了论证依据。

英文摘要:

We include the $Δ$-isobars in the equation of state (EOS) of neutron star (NS) and study its effects with various parameter sets of the RMF model. We compare our results with the NS's constraints from the mass-radius measurement of PSR J0348+0432, PSR J1614-2230, PSR J0030+0451, PSR J0740+6620, PSR J0952-0607, and tidal deformability of GW170817. We calculate the mass-radius profile and tidal deformabilities of the NS using 21 parameter sets of the RMF model.Analyzing the result with various parameters, it is clear that only few parameter sets can satisfy simultaneously the constraints from NICER and GW170817. NLD parameter set satisfy all the constraints of NICER and GW170817. For its strong predictive power for the bulk properties of the neutron star, we take NLD parameter set as a representative for the detailed calculation of effect of $Δ$-isobar on neutron star properties. We demonstrate that it is possible that $Δ$-isobar can produce at 2-3 times the saturation density by adjusting the coupling constants $X_{σΔ}$, $X_{ρΔ}$ and $X_{ωΔ}$ in an appropriate range. Bulk properties of the NS like mass-radius profile and tidal deformability is strongly affected by the interaction strength of $Δ$-isobar. Our calculation shows that it is also possible that by choosing $X_{σΔ}$, $X_{ρΔ}$ and $X_{ωΔ}$ to a suitable range the threshold density of $Δ^-$-isobar become lower than $Λ^0$ hyperon. For a particular value of $Δ$-coupling constants, the $R_{1.4}$ decrease by 1.7 km. This manuscipt give an argumentative justification for allowing $Δ$-isobar degrees of freedom in the calculation of the NS properties.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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