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银河系暗物质正电子通量计算的评述

Comment on Calculation of Positron Flux from Galactic Dark Matter

Maxim Perelstein, Bibhushan Shakya

摘要:

银河系中暗物质粒子湮灭或衰变产生的高能正电子可以作为暗物质的重要间接特征。在给定的暗物质模型中计算正电子通量需要求解输运方程,该方程考虑了正电子与物质和银河系磁场的相互作用。现有的计算解决了扩散区内的方程,银河磁场限制正电子,并假设在这个区域的边界上消失的正电子密度。然而,在许多模型中,暗物质晕的很大一部分位于扩散区之外。在那里产生的正电子可以进入扩散区并被捕获,可能到达地球并增加预期的通量。我们计算了各种型号的这种增强。我们还评估了额外正电子在星光和宇宙微波背景上的逆康普顿散射所产生的高能光子通量的预期增强。在这两种情况下,我们发现最大的通量增强的顺序为20%。

英文摘要:

Energetic positrons produced in annihilation or decay of dark matter particles in the Milky Way can serve as an important indirect signature of dark matter. Computing the positron flux expected in a given dark matter model involves solving transport equations, which account for interaction of positrons with matter and galactic magnetic fields. Existing calculations solve the equations inside the diffusion zone, where galactic magnetic fields confine positrons, and assume vanishing positron density on the boundaries of this zone. However, in many models, a substantial fraction of the dark matter halo lies outside the diffusion zone. Positrons produced there can then enter the diffusion zone and get trapped, potentially reaching the Earth and increasing the expected flux. We calculate this enhancement for a variety of models. We also evaluate the expected enhancement of the flux of energetic photons produced by the inverse Compton scattering of the extra positrons on starlight and cosmic microwave background. We find maximal flux enhancements of order 20% in both cases.

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