Title: Self-trapping as the possible beaming mechanism for FRB Show Chinese title

Title: 自捕获作为FRB可能的束流机制

Abstract: Mysterious Fast Radio Bursts (FRB), still eluding a rational explanation, are astronomical radio flashes with durations of milliseconds. They are thought to be of an extragalactic origin, with luminosities orders of magnitude larger than any known short timescale radio transients. Numerous models have been proposed in order to explain these powerful and brief outbursts but none of them is commonly accepted, it is not clear which of these scenarios might account for real FRB. The crucial question that remains unanswered is: what makes FRB so exceptionally powerful and so exceptionally rare?! If the bursts are related with something happening with a star-scale object and its immediate neighborhood, why all detected FRB events take place in very distant galaxies and not in our own galaxy!? In this paper we argue that the non-linear phenomenon - self-trapping - which may provide efficient but rarely occurring beaming of radio emission towards an observer, coupled with another, also rare but powerful phenomenon providing the initial radio emission, may account for the ultra-rare appearance of FRB. Show Chinese abstract

Abstract: 神秘的快速射电暴（FRB），至今仍未得到合理的解释，是持续时间为毫秒的天文射电闪光。 它们被认为起源于河外星系，其亮度比已知的任何短时间尺度射电瞬变现象都要高出几个数量级。 为了解释这些强大而短暂的爆发，提出了许多模型，但没有一个被普遍接受，目前尚不清楚这些情景中的哪一个能真正解释FRB。 尚未回答的关键问题是：是什么让FRB如此异常强大且如此稀少？！ 如果这些爆发与恒星尺度天体及其邻近区域发生的事情有关，那么为什么所有检测到的FRB事件都发生在非常遥远的星系中，而不是我们自己的银河系呢？！ 在这篇论文中，我们认为非线性现象——自约束效应，可能为射电波束提供有效但罕见的定向观测，结合另一种同样稀少但强大的初始射电发射现象，或许可以解释FRB的超低出现率。