标题： 过去γ射线暴能否同时解释INTEGRAL和ATIC/PAMELA/Fermi异常？ 显示英文标题

标题： Can past gamma-ray bursts explain both INTEGRAL and ATIC/PAMELA/Fermi anomalies simultaneously?

摘要： 伽马射线暴（GRBs）曾被用来解释来自星系 bulge 的 511 keV 发射以及从 ATIC、PAMELA 和 Fermi 数据推断出的高能正电子过剩。 虽然这些现象可能各自有独立的解释，但我们探讨了它们具有共同 GRB 相关起源的可能性，通过建模 GRB 分布并估算其发生率。 对于预期的银河系长伽马射线暴率，这两种信号都不是普遍存在的；局部过剩需要 2% 的巧合，而来自星系中心的信号需要相对于最近一次 GRB 时间的 20% 的巧合。同时解释这两种现象则需要 0.4% 的巧合。 考虑到寻找新物理时产生的大量统计“试验”，几个百分点的巧合不能轻易被视为不可能。 或者，如果银河系爆发率高于预期，这两种现象都可以由 GRBs 解释。 我们还表明，假设简化版短伽马射线暴分布的情况下，难以得到类似的结果。 显示英文摘要

摘要： Gamma-ray bursts (GRBs) have been invoked to explain both the 511 keV emission from the galactic bulge and the high-energy positron excess inferred from the ATIC, PAMELA, and Fermi data. While independent explanations can be responsible for these phenomena, we explore the possibility of their common GRB-related origin by modeling the GRB distribution and estimating the rates. For an expected Milky Way long GRB rate, neither of the two signals is generic; the local excess requires a 2% coincidence, while the signal from the galactic center requires a 20% coincidence with respect to the timing of the latest GRB. The simultaneous explanation requires a 0.4% coincidence. Considering the large number of statistical "trials" created by multiple searches for new physics, the coincidences of a few per cent cannot be dismissed as unlikely. Alternatively, both phenomena can be explained by GRBs if the galactic rate is higher than expected. We also show that a similar result is difficult to obtain assuming a simplified short GRB distribution.