速度调制引起的曲率扰动
Curvature perturbation from velocity modulation
摘要：
我们提出了一个新的变量模型的调制再加热。如果粒子的速度或等效的洛伦兹因子有大尺度的波动，衰变率也会波动，并且曲率扰动是通过它们的衰变过程诱导的，类似于调制再加热。例如，如果它们是由另一个质量在大尺度上波动的场的衰变以非热的方式产生的，那么这种情况就可以实现。我们明确地计算所产生的曲率扰动和非线性参数，并表明速度调制的影响是不可忽略的，如果粒子是半相对论性的衰变。
英文摘要：
We propose a new variant model of the modulated reheating. If particles have large scale fluctuations on their velocities, or equivalently their Lorentz factors, the decay rate also fluctuates and the curvature perturbation is induced via their decay processes in analogy with modulated reheating. For example, if they are produced nonthermally by the decay of another field with its mass fluctuating on large scales, such a situation is realized. We explicitly calculate the resulting curvature perturbation and non-linearity parameters and show that the effect of velocity-modulation is not negligible if the particles are semi-relativistic at the decay.
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