利用快速旋转中子星约束超子相对论平均场模型
Constraining hyperonic relativistic mean-field models with rapidly rotating neutron stars
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中文总结 AI 辅助
本研究以PSR J0952−0607脉冲星的质量测量结果为依据，采用自旋-味SU(6)对称方案引入超子，通过计算旋转中子星构型，将该脉冲星的观测约束映射到RMF模型的参数空间，实现对超子RMF模型的约束。
中文摘要 AI 辅助
受黑寡妇脉冲星PSR J0952−0607质量测量结果（M=2.35±0.11 M⊙）的启发，本研究探讨大质量快速旋转毫秒脉冲星的质量如何用于约束包含超子自由度的相对论平均场（RMF）模型。本方法遵循自旋-味SU(6)对称方案引入超子，用于矢量介子耦合。研究发现，增大非线性ω介子矢量自耦合参数ζ会抑制超子分数，并改变Σ⁻与Ξ⁻超子的出现顺序。通过计算PSR J0952−0607观测到的707 Hz自旋频率下的旋转中子星构型，确定与该脉冲星观测质量下限兼容的RMF模型。利用最大中子星质量的经验关系，将PSR J0952−0607的观测约束映射到n₀、m*和ζ的允许RMF参数空间中。
英文摘要
Motivated by the recent mass measurement of the black-widow pulsar PSR~J0952$-$0607 with $M=2.35\pm0.11\,M_\odot$, we investigate how the masses of heavy, rapidly rotating millisecond pulsars can be used to constrain relativistic mean-field (RMF) models containing hyperonic degrees of freedom. In our approach, hyperons are incorporated following the spin-flavor SU(6) symmetry scheme for the vector-meson couplings. We find that increasing the nonlinear $ω$-meson vector self-coupling parameter $ζ$ suppresses the hyperon fraction and can alter the onset ordering of the $Σ^-$ and $Ξ^-$ hyperons. By computing rotating neutron-star configurations at the observed spin frequency $707\,\mathrm{Hz}$ of PSR~J0952$-$0607, we identify RMF models compatible with this pulsar's observed lower-mass bound. Using an empirical relation for the maximum neutron star mass, the PSR~J0952$-$0607 observational contraint is mapped onto the allowed RMF parameter space in $n_0$, $m^\ast$, and $ζ$.
