Fast radio bursts (FRBs) are millisecond-duration extragalactic radio transients. They fall into the categories of repeaters and apparent nonrepeaters. However, such a classification causes a lack of motivation to investigate the physical picture. Here, we propose a unified geometric model to distinguish between repeaters and apparent nonrepeaters, in which the quasi-tangential (QT) propagation effect within the magnetosphere of a neutron star is considered. In this model, apparent nonrepeaters arise from sources whose emitting region has a smaller impact angle with respect to the magnetic axis, while repeaters come from sources whose emitting region has a larger impact angle. The observational discriminant polarization properties between repeaters and apparent nonrepeaters are an important clue for verifying this unified geometric model since the polarization is sensitive to the QT propagation effect. Moreover, our model effectively explains all of the other discriminant properties, including bandwidth, duration, peak luminosity, energy, brightness temperature, time–frequency downward drifting, and repetition rate, providing compelling evidence for the magnetospheric origin of FRBs.

中文翻译：

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重复和非重复快速射电爆发的几何中子星模型

快速射电爆发（FRB）是持续时间为毫秒的河外射电瞬变。它们属于中继者和明显的非中继者类别。然而，这样的分类导致缺乏研究物理图像的动力。在这里，我们提出了一个统一的几何模型来区分中继器和表观非中继器，其中考虑了中子星磁层内的准切向（QT）传播效应。在此模型中，明显的非中继器来自其发射区域相对于磁轴具有较小冲击角的源，而中继器来自其发射区域具有较大冲击角的源。由于偏振对 QT 传播效应敏感，中继器和表观非中继器之间的观测判别偏振特性是验证该统一几何模型的重要线索。此外，我们的模型有效地解释了所有其他判别特性，包括带宽、持续时间、峰值光度、能量、亮温、时频向下漂移和重复率，为快速射电暴的磁层起源提供了令人信服的证据。