Dark energy from quantum fluctuations
Abstract
We have derived the quantum vacuum pressure Pvac as a primary entity, removing a trivial and a gauge terms from the cosmological constant-like part (the zeroth term) of the effective action for a free matter field. The quantum vacuum energy density Gvac appears a secondary entity, but both are of expected order. Moreover Pvac and Gvac are dynamical, and therefore they can be used in the Einstein equations. In particular, they could dynamically support holographic dark energy model as well as the `thermodynamic' one.
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