标题： 早期宇宙中中微子衰变产生的$W$玻色子 显示英文标题

标题： Early Universe production of $W$ bosons in neutrino decays

摘要： 本文中，我们通过微扰方法研究了宇宙早期阶段中性中微子衰变过程中产生的$W$玻色子的产生率。我们计算了 de Sitter 电弱微扰理论的一阶跃迁幅度，并研究了其各种极限情况。跃迁率使用最小减除和维度正则化方法得出。最终，我们得到了玻色子的密度数（作为温度的函数），并对不同温度和固定粒子动量值下的该数值进行了估计。 显示英文摘要

摘要： In this paper we study, via perturbative methods, the rates of production of $W$ bosons emitted in neutrino decays during the early stages of the Universe. We compute the transition amplitude corresponding to the first order of de Sitter electro-weak perturbation theory and study its various limiting cases. The transition rates are derived using minimal subtraction and dimensional regularization. In the end we obtain the density number of bosons (as a function of temperature), and give an estimation of this number for different temperatures and fixed values of the particle momenta.