论文标题
部分可观测时空混沌系统的无模型预测
Mimetic K-essence
论文作者
论文摘要
我们提出了一种新的非平凡方法，将模仿暗物质与非模仿重力的模拟表述相结合。这产生了一个Weyl不变的高导数标量媒介理论。我们证明，它的壳行为模仿gr，并具有额外的k史标量。 K效果的总体规模是一种整合常数 - 一种全球的自由程度。有趣的是，我们发现所产生的液体无法通过状态的超相关方程进行过渡。我们开发了一种方法来找到与任何合格的k- essence相对应的模拟理论，并识别哪些k ensesences可以或不能以这种方式再现。最后，我们表明，放弃设置的Weyl对称性使我们能够同时获得单模型的重力和模拟暗物质，从一个共形重新定义度量。
We propose a new non-trivial way to combine mimetic dark matter with the mimetic formulation of unimodular gravity. This yields a Weyl-invariant higher-derivative scalar-vector-tensor theory. We demonstrate that on-shell its behavior mimics GR with an additional k-essence scalar. The overall scale of the k-essence arises as an integration constant -- a global degree of freedom. Interestingly, we find that the resulting fluid cannot make transition through ultra-relativistic equation of state. We develop a method to find a mimetic theory corresponding to any eligible k-essence and identify, which k-essences can or cannot be reproduced this way. Finally, we show that abandoning the Weyl symmetry of the setup allows us to obtain both unimodular gravity and mimetic dark matter simultaneously, from one conformal redefinition of the metric.
