强球面电磁波中的粒子加速和辐射反应
Particle acceleration and radiation reaction in strong spherical electromagnetic waves
摘要：
强磁化和快速旋转的中子星被认为是其磁层和风中的有效粒子加速器。他们被怀疑加速轻子，质子，也许离子极端相对论制度，辐射反应显着反馈到他们的运动。在中子星附近，磁场强度接近$B_{\rm c} \sim 4.4\times10^9$ T的临界值，粒子洛伦兹因子的顺序为$γ\sim 10^9$。本文研究了脉冲星风区的加速度反馈和辐射反馈，其中大振幅低频电磁波从光柱发射。我们设计了一个半解析程序，精确求解任意强度参数椭圆极化的类零电磁波在Landau-Lifshits近似下包含辐射反应的粒子运动方程。在常规脉冲星条件下，在离中子星很远的地方，渐近洛伦兹因子高达$10^8-10^9$。然而，我们表明，在风区，在球面波近似，辐射反应反馈仍然可以忽略不计。
英文摘要：
Strongly magnetized and fast rotating neutron stars are known to be efficient particle accelerators within their magnetosphere and wind. They are suspected to accelerate leptons, protons and maybe ions to extreme relativistic regimes where the radiation reaction significantly feeds back to their motion. In the vicinity of neutron stars, magnetic field strengths are close to the critical value of $B_{\rm c} \sim 4.4\times10^9$T and particle Lorentz factors of the order $γ\sim 10^9$ are expected. In this paper, we investigate the acceleration and radiation reaction feedback in the pulsar wind zone where a large amplitude low frequency electromagnetic wave is launched starting from the light-cylinder. We design a semi-analytical code solving exactly the particle equation of motion including radiation reaction in the Landau-Lifshits approximation for a null-like electromagnetic wave of arbitrary strength parameter and elliptical polarization. Under conventional pulsar conditions, asymptotic Lorentz factor as high as $10^8-10^9$ are reached at large distances from the neutron star. However, we demonstrate that in the wind zone, within the spherical wave approximation, radiation reaction feedback remains negligible.
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