arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1107.5583astro-ph.HEhep-ph
收藏

系统学解释来自伽马射线暴的聚集中微子通量极限和风味比

Systematics in the Interpretation of Aggregated Neutrino Flux Limits and Flavor Ratios from Gamma-Ray Bursts

Philipp Baerwald, Svenja Hümmer, Walter Winter

摘要:

中微子望远镜上的伽马射线暴分析通常基于漫射或堆叠(即,聚合)中微子通量,因为预期从一个单一的爆发事件的数量是小的。聚集通量限制的解释意味着新的系统学不存在一个单一的爆发,如通过整合参数分布(扩散通量),或通过小爆发样本(叠加通量)的低统计。我们模拟参数分布的Monte Carlo方法计算的光谱突发的突发,相比传统的Monte Carlo积分。通过这种方法,我们可以预测扩散极限以及低统计堆积样本中的通量行为,例如最近IceCube数据分析中使用的。我们还包括在检测器的味道组成(μ子轨道和级联之间的比例)到我们的考虑。我们表明,光谱特征,如来自光强子相互作用,风味混合,和磁场效应的特征多峰结构,通常存在,即使在扩散中微子通量,如果只考虑源的红移分布,与z \simeq 1占主导地位的中微子通量。另一方面,我们表明,洛伦兹助推的变化只能解释在一个依赖于模型的方式,并可以作为一个模型?例如,我们说明,在聚集通量的光谱特征的观察将不赞成常用的假设,即小洛伦兹因子的爆发占主导地位的中微子通量,而它将是一致的假设,即爆发具有相似的属性,在共动框架。

英文摘要:

Gamma-ray burst analyses at neutrino telescopes are typically based on diffuse or stacked (i.e., aggregated) neutrino fluxes, because the number of events expected from a single burst is small. The interpretation of aggregated flux limits implies new systematics not present for a single burst, such as by the integration over parameter distributions (diffuse fluxes), or by the low statistics in small burst samples (stacked fluxes). We simulate parameter distributions with a Monte Carlo method computing the spectra burst by burst, as compared to a conventional Monte Carlo integration. With this approach, we can predict the behavior of the flux in the diffuse limit as well as in low statistics stacking samples, such as used in recent IceCube data analyses. We also include the flavor composition at the detector (ratio between muon tracks and cascades) into our considerations. We demonstrate that the spectral features, such as a characteristic multi-peak structure coming from photohadronic interactions, flavor mixing, and magnetic field effects, are typically present even in diffuse neutrino fluxes if only the redshift distribution of the sources is considered, with z \simeq 1 dominating the neutrino flux. On the other hand, we show that variations of the Lorentz boost can only be interpreted in a model-dependent way, and can be used as a model discriminator. For example, we illustrate that the observation of spectral features in aggregated fluxes will disfavor the commonly used assumption that bursts with small Lorentz factors dominate the neutrino flux, whereas it will be consistent with the hypothesis that the bursts have similar properties in the comoving frame.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑