We attempt a novel mechanism to understand the underlying cause of late-time cosmic acceleration using a distinguished physical process taking place in the late Universe. In our opinion, the turning of massive neutrinos from relativistic to non-relativistic might cause a phase transition at late times. We implement this idea using massless $\lambda {\varphi }^4$ theory coupled to massive neutrino matter such that the coupling is proportional to the trace of the energy-momentum tensor of neutrino matter. As massive neutrinos become non-relativistic, their coupling to the scalar field builds up dynamically giving rise to spontaneous symmetry breaking in the low-density regime. As a result, in the true vacuum, the field acquires non zero mass proportional to the energy density of massive neutrino matter and could give rise to late-time cosmic acceleration. We also address the issues related to stability of self coupling under radiative corrections.

我们尝试一种新颖的机制来利用晚宇宙发生的杰出物理过程来理解晚宇宙加速的根本原因。我们认为，大量中微子从相对论转向非相对论可能会在后期引起相变。我们使用无质量实现​​这个想法$\lambda {\varphi }^4$该理论与大量中微子物质耦合，使得该耦合与中微子物质的能量动量张量的轨迹成比例。随着大量中微子变得非相对论，它们与标量场的耦合会动态建立，从而在低密度状态下导致自发对称性破裂。结果，在真正的真空中，该场获得的质量与中微子物质能量密度成正比的非零质量，并可能导致后期宇宙加速。我们还将解决与辐射校正下的自耦合稳定性有关的问题。