生长中中微子质量中中微子团的动力学
Dynamics of neutrino lumps in growing neutrino quintessence
摘要：
我们研究了宇宙学中大尺度中微子结构的形成和耗散，其中动态暗能量的时间演化被不断增长的中微子质量所阻止。在中微子和暗能量之间的耦合随着标量宇宙子场的值而增长的模型中，中微子块的演化取决于中微子质量。对于较小的质量，团块周期性地形成和溶解，在宇宙演化中只留下中微子结构的小反反应。这个过程将中微子加热到远高于光子温度的温度，使得中微子再次获得几乎相对论性的状态方程。目前的状态方程的组合宇宙中微子流体是非常接近-1。相反，中微子质量越大，团越稳定。高浓度的中微子结构需要一个大的反反应类似于一个恒定的中微子宇宙子耦合的情况下。目前中微子的平均质量约为0.5 eV，这似乎与观测结果相符。对于低于这个值的质量，中微子诱导的引力势仍然很小，使得块难以检测。
英文摘要：
We investigate the formation and dissipation of large scale neutrino structures in cosmologies where the time evolution of dynamical dark energy is stopped by a growing neutrino mass. In models where the coupling between neutrinos and dark energy grows with the value of the scalar cosmon field, the evolution of neutrino lumps depends on the neutrino mass. For small masses the lumps form and dissolve periodically, leaving only a small backreaction of the neutrino structures on the cosmic evolution. This process heats the neutrinos to temperatures much above the photon temperature such that neutrinos acquire again an almost relativistic equation of state. The present equation of state of the combined cosmon-neutrino fluid is very close to -1. In contrast, for larger neutrino masses the lumps become stable. The highly concentrated neutrino structures entail a large backreaction similar to the case of a constant neutrino-cosmon coupling. A present average neutrino mass of around 0.5 eV seems so far compatible with observation. For masses lower than this value, neutrino induced gravitational potentials remain small, making the lumps difficult to detect.
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