论文标题
FLRW宇宙中振荡标量背景的耗散
Dissipation of oscillating scalar backgrounds in an FLRW universe
论文作者
论文摘要
我们使用非平衡量子场理论研究了空间平坦的Friedmann-Lema-Robertson-Walker宇宙中振荡标量背景的耗散。为了具体，使用了具有四分之一交互的$ Z_2 $ -SMMETRIC两尺度模型。对于准谐波振荡，我们采用多尺度分析，以稳定的自我能源和延迟适当的四个vertex函数来获得标量背景演变的分析近似表达式。与平时的情况不同，我们发现在扩展的宇宙中，只有在智障自我能源的虚构部分并不可忽略不计时，该模型中的冷凝物衰减才能完成。还讨论了在颗粒产生方面对智障自能量和延迟适当的四个vertex功能的虚构部分的微物理解释。
We study the dissipation of oscillating scalar backgrounds in a spatially flat Friedmann-Lemaître-Robertson-Walker universe using non-equilibrium quantum field theory. To be concrete, a $Z_2$-symmetric two-scalar model with quartic interactions is used. For quasi-harmonic oscillations, we adopt the multi-scale analysis to obtain analytical approximate expressions for the evolution of the scalar background in terms of the retarded self-energy and retarded proper four-vertex function. Different from the case in flat spacetime, we find that in an expanding universe the condensate decay in this model can be complete only if the imaginary part of the retarded self-energy is not negligibly small. The microphysical interpretation of the imaginary parts of the retarded self-energy and retarded proper four-vertex function in terms of particle production is also discussed.
