标题： 中微子团块在增长的中微子五重态中的动力学 显示英文标题

标题： Dynamics of neutrino lumps in growing neutrino quintessence

摘要： 我们研究了在暗能量动力学演化被增长的中微子质量停止的宇宙学中，大尺度中微子结构的形成与消散。在中微子和暗能量之间的耦合随标量cosmon场值增长的模型中，中微子团块的演化依赖于中微子的质量。对于较小的质量，团块会周期性地形成和溶解，仅对宇宙演化产生很小的回响效应。此过程使中微子加热到远高于光子温度，从而使中微子再次获得接近相对论的状态方程。当前cosmon-中微子流体的总状态方程非常接近-1。相反，对于较大的中微子质量，团块变得稳定。高度集中的中微子结构导致了类似恒定中微子-cosmon耦合情况下的较大回响效应。目前平均中微子质量约为0.5 eV似乎与观测结果相容。对于低于该值的质量，由中微子诱导的引力势仍然较小，使得这些团块难以探测。 显示英文摘要

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.