An anthropic explanation of the evident smallness of the dark energy (DE) density value implies the existence of a time-dependent component of the scalar field, serving, together with a negative-valued cosmological constant, as one of two components to the overall DE density. The observers (i.e. us) might then only evolve in those regions of the universe where the sum of those two components (the positive and a negative ones) is sufficiently close to zero. However, according to Vilenkin and Garriga, the scalar field component has to slowly but surely diminish in time. In about a trillion years, this process will put a cap to the now-observable accelerated expansion of the universe, leading to a subsequent phase of impending collapse. However, the vanishing scalar field might also produce some rather unexpected singularities with a finite nonzero scale factor. We analyze this possibility using a particular example of a Sudden Future Singularities (SFS) and come to a startling conclusion that the time required for an SFS to arise must be “comparable” to the lifetime of the observable universe.

中文翻译：

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人类原理可以告诉我们有关暗能量宇宙未来的信息

人类对暗能量（DE）密度值明显较小的解释表明，标量场存在与时间有关的分量，并与负值宇宙常数一起用作整个DE的两个分量之一密度。然后，观察者（即我们）可能只会在宇宙中这两个分量（正负分量）之和足够接近于零的那些区域中演化。然而，根据维伦金（Vilenkin）和加里加（Garriga）的观点，标量场分量必须在时间上缓慢但确实减小。在大约一万亿年的时间里，这个过程将限制现在可观察到的宇宙加速扩张，从而导致即将到来的崩溃阶段。然而，消失的标量场也可能会产生一些具有非零比例因子的相当奇怪的奇点。我们使用一个特殊的突然未来奇点（SFS）实例来分析这种可能性，并得出一个惊人的结论，即SFS出现所需的时间必须与可观测的宇宙的寿命“可比”。