Physics, mathematics, and technology

2020 Issue №3

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When to expect the unexpected singulari­ties: the anthropic principle and the dark energy universe



The anthropic explanation of the smallness of the observed amount of dark energy implies the presence of a variable component compensating for the mag­nitude of the vacuum energy. According to Garriga and Vilenkin, this com­ponent should decrease slowly, leading to a change in the accelerated ex­pansion regime to the collapse phase, but not earlier than in a trillion years. Ho­wever, a decreasing scalar field can lead to unexpected singularities with a fi­nite value of the scale factor. We analyze this situation using the example of SFS and get an unexpected result: the time of appearance of such features of the same order as the lifetime of the observed universe.