标题： 基于与超导性类比的冷暗物质 显示英文标题

标题： Cold Dark Matter Based on an Analogy with Superconductivity

摘要： 我们提出了一种冷暗物质的新候选者，它由具有手征对称性破缺的相互作用费米子理论中的凝聚库珀对组成。从早期辐射时代到现在的热历史得以确立，费米子在高温下表现出像标准辐射一样的行为，但随后经历了一个临界时期，其衰减速率比辐射快，类似于冻结过程，设定了残留丰度。通过二阶相变，费米子-反费米子对凝聚，系统趋于零温度和压力。在目前的时代，非相对论性的大质量凝聚体衰减速率略快于标准情景——这是一个独特的预测，可能通过宇宙微波背景和大尺度结构的联合测量进行检验。我们还表明，在大质量费米子的情况下，相变受到阻碍，冻结过程则留下了一个剩余的、寿命很长的暗能量源。 显示英文摘要

摘要： We present a novel candidate for cold dark matter consisting of condensed Cooper pairs in a theory of interacting fermions with broken chiral symmetry. Establishing the thermal history from the early radiation era to the present, the fermions are shown to behave like standard radiation at high temperatures, but then experience a critical era decaying faster than radiation, akin to freeze-out that sets the relic abundance. Through a second-order phase transition, fermion - antifermion pairs condense and the system asymptotes towards zero temperature and pressure. By the present era, the non-relativistic, massive condensate decays slightly faster than in the standard scenario -- a unique prediction that may be tested by combined measurements of the cosmic microwave background and large scale structure. We also show that in the case of massive fermions, the phase transition is frustrated, and freeze-out instead leaves a residual, long-lived source of dark energy.