标题： 探索短伽马射线暴中的喷流结构和动力学：对GRB 090510的案例研究 显示英文标题

标题： Exploring Jet Structure and Dynamics in Short Gamma Ray Bursts: A Case Study on GRB 090510

摘要： 高能观测到的伽马射线暴允许研究这些仍然令人困惑事件的辐射过程。 在本研究中，我们进行广义相对论磁流体动力学（GRMHD）模拟来研究GRB 090510，这是一个由Fermi-LAT探测到的特殊短时伽马射线暴。 我们的主要目标是模拟爆发的能量、喷流结构、变化性和张开角度，以了解其潜在的物理条件。 我们测试了二维和三维模型，并估计了变化的时间尺度。 当考虑到喷流张开角度也随着红移演化时，预测的能量和喷流张开角度与观测结果一致，误差为1$\sigma$。 此外，我们通过将动态抛射物引入选定模型来扩展分析，以研究其在较小距离上对喷流准直的影响。 此外，我们研究了一套表现出广泛可观测伽马射线暴特性的模型，从而将我们的理解扩展到这一特定事件之外。 显示英文摘要

摘要： Gamma-ray bursts observed in high-energies allow the investigation of the emission processes of these still puzzling events. In this study, we perform general relativistic magnetohydrodynamic (GRMHD) simulations to investigate GRB 090510, a peculiar short GRB detected by Fermi-LAT. Our primary goal is to model the energetics, jet structure, variability, and opening angle of the burst to understand its underlying physical conditions. We tested the 2D and 3D models and estimated the time scale of variability. The predicted energetics and the jet opening angle reconcile with the observed ones with 1$\sigma$ when considering that the jet opening angles also evolve with redshift. Furthermore, we extend our analysis by incorporating dynamical ejecta into selected models to study its impact on jet collimation at smaller distances. In addition, we investigated a suite of models exhibiting a broad range of observable GRB properties, thereby extending our understanding beyond this specific event.