标题： 暗能量对中子星表面引力红移和开普勒频率的影响 显示英文标题

标题： Dark energy effects on surface gravitational redshift and Keplerian frequency of neutron stars

摘要： 具有暗能量的中子星性质的研究是天体物理学中一个特别有趣但尚未解决的问题。 我们使用GM1和TM1参数集，结合PSR J1614-2230、PSR J0348+0432、PSR J0030+0451、RX J0720.4-3125和1E 1207.4-5209的观测数据，在相对论平均场理论框架下分析了暗能量对传统中子星和超子星物质的状态方程、最大质量、表面引力红移以及开普勒频率的影响，同时考虑了SU(6)和SU(3)的两种味对称性。 结果表明，暗能量的存在导致了传统中子星和超子星状态方程的软化。固定质量的传统中子星（或超子星）在存在暗能量的情况下半径变得更小，从而增加了致密性。暗能量的存在还可以增强传统中子星和超子星的表面引力红移和开普勒频率。开普勒频率的增长可能会导致自旋速率加快，这可能为理解脉冲星脉冲现象提供一种可能的途径。 具体而言，我们推断对于GM1（TM1）参数集，不存在暗能量时PSR J1748-2446ad的质量和表面引力红移分别为1.141$M_\odot$（1.309$M_\odot$）和0.095（0.105）。如果PSR J1748-2446ad包含$\alpha=0.05$的暗能量，GM1（TM1）参数集对应的值分别为0.901$M_\odot$（1.072$M_\odot$）和0.079（0.091）。根据我们所选模型，PSR J1748-2446ad可能是一个低质量脉冲星，具有较低的表面引力红移。 显示英文摘要

摘要： The research of the properties of neutron stars with dark energy is a particularly interesting yet unresolved problem in astrophysics. We analyze the influence of dark energy on the equation of state, the maximum mass, the surface gravitational redshift, and the Keplerian frequency for the traditional neutron star and the hyperon star matter within the relativistic mean field theory, using the GM1 and TM1 parameter sets by considering the two flavor symmetries of SU(6) and SU(3) combined with the observations of PSR J1614-2230, PSR J0348+0432, PSR J0030+0451, RX J0720.4-3125, and 1E 1207.4-5209. It is found that the existence of dark energy leads to the softened equations of state of the traditional neutron star and the hyperon star. The radius of a fixed-mass traditional neutron star (or hyperon star) with dark energy becomes smaller, which leads to increased compactness. The existence of dark energy can also enhance the surface gravitational redshift and the Keplerian frequency of the traditional neutron stars and the hyperon stars. The growth of the Keplerian frequency may cause speeding up of the spin rate, which may provide a possible way to understand and explain the pulsar glitch phenomenon. Specifically, we infer that the mass and the surface gravitational redshift of PSR J1748-2446ad without dark energy for the GM1 (TM1) parameter set are 1.141 $M_\odot$ (1.309 $M_\odot$) and 0.095 (0.105), respectively. The corresponding values for the GM1 (TM1) parameter set are 0.901 $M_\odot$ (1.072 $M_\odot$) and 0.079 (0.091) if PSR J1748-2446ad contains dark energy with $\alpha=0.05$. PSR J1748-2446ad may be a low-mass pulsar with a lower surface gravitational redshift under our selected models.