Theoretical and numerical aspects of CMB spectral distortions from non-thermal energy injections
Theoretical and numerical aspects of CMB spectral distortions from non-thermal energy injections
复制标题
非热能注入引起的 CMB 光谱畸变的理论和数值方面
DOI：
10.1142/9789811269776_0128
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Acharya S
中科院分区：
文献类型：
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作者：
Acharya S
光子与热电子的康普顿散射是自然界中最普遍的现象之一。在这种情况下，解决光子演化的数值方法通常假设能量交换比电子的温度小得多。在这项工作中，我们解决了光子演化的完全一般性，没有扩散近似，并显示了精确解和近似解之间的区别。我们指出了康普顿散射精确运动学的求解对于计算宇宙微波背景（CMB）在红移(z) > 3 × 104处的光谱畸变的重要性。
Compton scattering of photons with thermal electrons is one of the most ubiquitous phenomenon in nature. Numerical approaches to solve the evolution of photons in such situations typically assume the energy exchange to be much smaller compared to the temperature of electrons. In this work, we solve the photon evolution in its full generality, without the diffusion approximation, and show the differences between the exact solution and approximate solutions. We point out the importance of solving exact kinematics of Compton scattering for the computation of Cosmic Microwave Background (CMB) spectral distortions at redshifts (z) ≲ 3 × 104.