Inhomogeneous vacuum energy

David Wands, Josue De Santiago, Yuting Wang

Research output: Contribution to journalArticlepeer-review

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Abstract

Vacuum energy remains the simplest model of dark energy which could drive the accelerated expansion of the Universe without necessarily introducing any new degrees of freedom. Inhomogeneous vacuum energy is necessarily interacting in general relativity. Although the four-velocity of vacuum energy is undefined, an interacting vacuum has an energy transfer and the vacuum energy defines a particular foliation of spacetime with spatially homogeneous vacuum energy in cosmological solutions. It is possible to give a consistent description of vacuum dynamics and in particular the relativistic equations of motion for inhomogeneous perturbations given a covariant prescription for the vacuum energy, or equivalently the energy transfer four-vector, and we construct gauge-invariant vacuum perturbations. We show that any dark energy cosmology can be decomposed into an interacting vacuum+matter cosmology whose inhomogeneous perturbations obey simple first-order equations.
Original languageEnglish
Pages (from-to)145017
Number of pages1
JournalClassical and Quantum Gravity
Volume29
Issue number14
DOIs
Publication statusPublished - 21 Jul 2012

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