论文标题
各向异性中子星的平衡，径向稳定性和非绝热引力塌陷
Equilibrium, radial stability and non-adiabatic gravitational collapse of anisotropic neutron stars
论文作者
论文摘要
在这项工作中，我们为与重力波事件的约束GW170817和四个各向异性ANSATZE兼容的状态方程构建了各向异性中子星的家族。这样的恒星受到径向扰动的影响，以研究其对径向振荡的稳定性，我们开发了一个动力学模型来描述不稳定的各向异性构型的非绝热引力塌陷，其最终的命运是黑洞的形成。我们发现，径向稳定性的标准标准$ dm/dρ_c> 0 $并不总是与某些各向异性ANSATZE的振荡频率计算兼容，并且每个各向异性参数都受到了最大最大恒星质量的限制。我们在非绝热环境中进一步概括了TOV方程，并研究了状态方程，热通量，各向异性因子和质量功能的动力学行为，作为不稳定的各向异性恒星崩溃。获得演化方程后，我们作为静态限制恢复了背景方程。
In this work we construct families of anisotropic neutron stars for an equation of state compatible with the constraints of the gravitational-wave event GW170817 and for four anisotropy ansatze. Such stars are subjected to a radial perturbation in order to study their stability against radial oscillations and we develop a dynamical model to describe the non-adiabatic gravitational collapse of the unstable anisotropic configurations whose ultimate fate is the formation of a black hole. We find that the standard criterion for radial stability $dM/dρ_c >0$ is not always compatible with the calculation of the oscillation frequencies for some anisotropy ansatze, and each anisotropy parameter is constrained taking into account the recent restriction of maximum mass of neutron stars. We further generalize the TOV equations within a non-adiabatic context and we investigate the dynamical behaviour of the equation of state, heat flux, anisotropy factor and mass function as an unstable anisotropic star collapses. After obtaining the evolution equations we recover, as a static limit, the background equations.
