Abstract
The observable effects of large-scale (non-quantum) fluctuations of dark energy (DE) are discussed within the framework of classical general relativity. The paper is focused on different local rates of the cosmological expansion (the phenomenon known as the Hubble constant tension) and the contribution of DE fluctuations to the anisotropy of the cosmic microwave background radiation; other potentially observable effects of DE fluctuations are also indicated, e.g., a criterion for the existence of a structure larger than the observable universe.
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