关于QCD真空对暗能量贡献的可能补偿
On a possible compensation of the QCD vacuum contribution to the Dark Energy
摘要：
我们提出了一种可能的方法来补偿大的负量子拓扑QCD贡献的真空能量密度的宇宙通过一个积极的常数贡献从一个宇宙学杨米尔斯场。讨论了有限时间瞬子对应的杨-米尔斯场的精确特解的重要作用。一个有趣的连接的补偿机制的颜色限制的框架中的瞬子模型已被指出。除了$Λ_{\rm QCD}$标度之外，这个提议还依赖于一个自由的无量纲归一化常数，这个常数不能被微扰QCD理论固定，因此应该被微调以保持精确的补偿。
英文摘要：
We suggest one of the possible ways to compensate the large negative quantum-topological QCD contribution to the vacuum energy density of the Universe by means of a positive constant contribution from a cosmological Yang-Mills field. An important role of the exact particular solution for the Yang-Mills field corresponding to the finite-time instantons is discussed. An interesting connection of the compensation mechanism to the color confinement in the framework of instanton models has been pointed out. Besides the $Λ_{\rm QCD}$ scale, this proposal relies on one yet free dimensionless normalisation constant which cannot be fixed by the perturbative QCD theory, and thus should be fine-tuned for the exact compensation to hold.
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