脉冲星应力达到阈值时由星震触发的自转突变
Pulsar glitches triggered by quakes when stress reaches a threshold
- Peking University（北京大学）
- University of Chinese Academy of Sciences（中国科学院大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
通过比较时间可预测与幅度可预测模型，发现脉冲星自转突变由应力达到临界阈值触发，支持星震模型，临界应力量级与奇异子星剪切模量相符。
AI中文摘要：
基于积累的观测数据，重新审视了脉冲星自转突变的星震模型。借鉴地震学并基于经典弹簧-滑块框架，对时间可预测模型与幅度可预测模型进行了统计比较，样本包括来自9颗脉冲星的245次自转突变事件。研究发现，数据支持时间可预测模型，即当发展的应力达到临界阈值τ_c时，可能触发导致自转突变的星震，而震后剩余的弹性能（相应地，残余应力τ_r）并非固定。如果震后最大应力降幅对应的残余应力可视为可忽略（即τ_r≃0），则临界应力量级约为τ_c≃(10^34-10^35) dyn cm^-2，以解释自转突变幅度和间隔。该τ_c值相当于奇异子星的剪切模量量级，但比传统中子星高出几个数量级。
英文摘要：
The starquake model of pulsar glitches is revisited in light of accumulated observational data. A statistical comparison between the time-predictable and the magnitude-predictable models, borrowed from seismology and grounded in the classical spring-slider framework, is performed against a sample of 245 glitch events from 9 pulsars. It is found that the data supports the time-predictable model, i.e., a quake resulting in a glitch could be triggered when the developed stress reaches a critical threshold, $τ_{\rm c}$, while the remaining elastic energy (correspondingly the residual stress, $τ_{\rm r}$) after quakes is not fixed. The critical stress could be the order of $τ_{\rm c}\simeq (10^{34}-10^{35})\ {\rm dyn\,cm^{-2}}$ if the residual stress after a quake with maximum stress drops could be considered negligible (i.e., $τ_{\rm r}\simeq 0$), to explain the glitch amplitudes and the intervals. This $τ_{\rm c}$-value is the order of the shear modulus of strangeon stars, but would be several orders higher than that of conventional neutron stars.
