磁场对中微子主导吸积盘粒子丰度的影响  

Effect of Magnetic Field on Particle Fractions for Neutrino-dominated Accretion Disk

作　　者：林一清[1] 陈小红[2] 

机构地区：[1]厦门理工学院数理系,福建厦门361024 [2]厦门大学物理与机电工程学院,福建厦门361005

出　　处：《厦门大学学报（自然科学版）》2012年第1期22-25,共4页Journal of Xiamen University：Natural Science

基　　金：福建省青年人才创新项目(2007F3105)

摘　　要：中微子主导吸积盘被认为可能是伽玛射线暴中心能源机制的一种模型.为了详细地考虑微观粒子分布,计算了伪牛顿势框架下磁场对中微子主导吸积盘微观粒子丰度的影响.结果表明,在吸积盘的外区,磁场对粒子丰度和电子简并度几乎没有影响;而在吸积盘的内区,考虑和没考虑磁场时,电子简并度,电子、中子等粒子丰度具有比较大的差异.The Neutrino-dominated accretion disk is regarded as a plausible model for the central engine of gamma-ray burst. By taking into account detailed microphysics,we calculate the effect of magnetic field on particle fractions for neutrino-dominated accretion disk in the frame of the well-known Paczynski-Witta potential. The results show that magnetic field nearly don＇t affect the particle fractions and the electron degeneracy of the disk in the outer region, while, in the inner region, there exist significant differences in the electron degeneracy, the electron fraction, the neutron fraction and the other matter fraction between the disks with and without magnetic field.

关 键 词：伽玛射线暴 吸积盘 黑洞物理 

分 类 号：P172[天文地球—天文学]