Cosmic Ray Hydrodynamics

宇宙射线流体动力学

• 批准号: 0907837
• 负责人: Ellen Zweibel
• 金额: $ 60.04万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-07-01 至 2013-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0907837&HistoricalAwards=false
• 关键词: Cosmic; Ray; Hydrodynamics

AST-0907837ZweibelInterstellar and intergalactic gas is pervaded by relativistic charged particles known as cosmic rays, which account for a significant fraction of the energy density in the gas. A fluid theory of cosmic rays has been developed in which collisions with tiny electromagnetic fluctuations mimic collisions with particles, capturing cosmic ray physics on large scales and allowing some beautiful simulations of galaxy clusters and large scale structure formation. This project will extend and generalize the fluid picture of cosmic rays so as to capture viscous effects and to treat cosmic ray interaction with very weak magnetic fields in the intergalactic medium and in galaxies and galaxy clusters at early times. This improved picture will then be applied to assess the thermal stability and overall viscosity of intracluster gas, to estimate the rate at which intergalactic plasma is heated by cosmic rays, and to study the effects of cosmic rays on the stability of hot X-ray cavities in clusters. This work develops microscale physics through analytic calculation and state-of-the-art numerical simulations of restricted scope. The small scale processes that will be studied also apply to interstellar environments, to pulsar wind nebulae, and even to laboratory plasmas.The research will help to build bridges between the plasma physics and high energy neutrino astrophysics groups at the University of Wisconsin. The work involves postdoctoral training, undergraduate research, and public outreach using existing facilities and programs.This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).

AST-0907837ZweibelInterstellar和Galactic气体被称为宇宙射线的相对论带电颗粒所遍布，这是气体中能量密度的很大一部分。 已经开发了一种宇宙射线的流体理论，在该理论中，与微小的电磁波动的碰撞模仿了与颗粒的碰撞，在大尺度上捕获宇宙射线物理，并允许对星系簇和大型结构形成的一些精美的模拟。 该项目将扩展并概括宇宙射线的流体图像，以捕获粘性效应并在早期与星际培养基以及星系和星系簇中的磁场相互作用来处理宇宙射线的相互作用。 然后，这种改进的图像将应用于评估集群内气体的热稳定性和整体粘度，以估计宇宙射线加热的白术血浆的速率，并研究宇宙射线对簇中热X射线腔稳定性的影响。 这项工作通过分析计算和限制范围的最新数值模拟来开发微观物理学。 将研究的小规模工艺也适用于星际环境，脉冲星云，甚至适用于实验室等离子体。该研究将有助于在威斯康星大学的血浆物理学与高能量中性中微子天体物理学组之间建造桥梁。 这项工作涉及使用现有设施和计划的博士后培训，本科研究和公共外展。该奖项是根据2009年的《美国回收和再投资法》（公法111-5）资助的。