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I can understand that a photon in an expanding universe can be redshifted and lose its energy by its wavelength being stretched from space expansion.

But in the case of inflation and dark energy, it doesn’t dilute/decrease with the expansion so that means more energy is created to keep energy density constant.

Doesn’t it need to have a mechanism of creating energy? Or do we think that energy can be created out of nothing without any source or mechanism, like just a spontaneous increase in energy?

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