标题： FAST观测未发现FRB 20201124A的次秒级周期性证据 显示英文标题

标题： No Evidence for Second-Scale Periodicity in FRB 20201124A from FAST Observations

摘要： 快速射电暴（FRBs）是来自宇宙起源的明亮且短暂的无线电脉冲。 尽管在过去二十年中检测到了大量的FRBs，但它们的起源和产生这些现象的物理过程仍然是未知的。 近年来，磁星被认为是主要的起源候选者之一。 可以暗示这种磁星起源的一个显著特征是秒级周期性。 在本文中，我们定义了一个稳健的程序来搜索这种周期性并估计其结果的意义。 我们在FRB 20201124A的爆发中搜索这种周期性，该爆发由五百米口径球面望远镜（FAST）在2021年4月至6月间观测到。 我们的分析没有发现任何显著的周期性。 我们讨论了我们未检测到的结果与C. Du等人（2025）提出的约1.7秒周期性的差异。 显示英文摘要

摘要： Fast Radio Bursts (FRBs) are bright and short radio flashes of cosmological origin. Although a great number of FRBs were detected in the last two decades, their progenitors and the physical processes that create them are unknown. In recent years, magnetars have been proposed as one of the leading progenitor candidates. A striking feature that can hint at such a magnetar origin is second-scale periodicity. In this paper, we define a robust procedure to search for such periodicity and estimate the significance of its results. We search for such periodicity in the bursts of FRB 20201124A, observed by the Five-hundred-meter Aperture Spherical Telescope (FAST) between April and June 2021. Our analysis does not find any significant periodicity. We discuss the differences between our non-detection and the ~1.7s periodicity claim by C. Du et al. (2025).