用广义时变真空能解决主要宇宙学难题
Solving the main cosmological puzzles with a generalized time varying vacuum energy
摘要：
研究了真空能量密度随时间变化的FLRW平坦宇宙模型$Λ(t)$的动力学性质。特别地，我们研究了一个广义真空模型的动力学性质，发现在一定条件下，辐射时代的真空项为$Λ(z) \propto (1+z)^{4}$，而物质时代的真空项为$Λ(z)\propto (1+z)^{3}$到$z\simeq 3$和$Λ(z)=Λ$到$z\le 3$ .这种行为的确认将是至关重要的，因为它可以提供宇宙符合问题以及微调问题的解决方案，而不会改变众所周知的（从和谐$Λ$宇宙学）哈勃膨胀。
英文摘要：
We study the dynamics of the FLRW flat cosmological models in which the vacuum energy density varies with time, $Λ(t)$. In particular, we investigate the dynamical properties of a generalized vacuum model and we find that under certain conditions the vacuum term in the radiation era varies as $Λ(z) \propto (1+z)^{4}$, while in the matter era we have $Λ(z)\propto (1+z)^{3}$ up to $z\simeq 3$ and $Λ(z)=Λ$ for $z\le 3$. The confirmation of such a behavior would be of paramount importance because it could provide a solution to the cosmic coincidence problem as well as to the fine tuning problem, without changing the well known (from the concordance $Λ$ cosmology) Hubble expansion.
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