2012/09/04 by Josue De-Santiago, David Wands, Yuting Wang · 5 citations
Physics and Astronomy · #Chaplygin gas #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark energy #Energy (signal processing) #False vacuum #Noncommutative and Quantum Gravity Theories #QED vacuum #Quantum Electrodynamics and Casimir Effect #Scalar field dark matter #Spacetime #Vacuum energy #astro-ph.CO #gr-qc #hep-th
paper · pdf · doi:10.1007/978-3-319-02063-1_13
published in Astrophysics and space science proceedings, 183-196 (Springer International Publishing) · 10 pages, 5 figures; to appear in the proceedings of IV International Meeting on Gravitation and Cosmology, Guadalajara, May 2012
arxiv created 2012/09/04 · openalex publication_date 2013/11/27 · arxiv updated 2014/07/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Vacuum energy is a simple model for dark energy driving an accelerated expansion of the universe. If the vacuum energy is inhomogeneous in spacetime then it must be interacting. We present the general equations for a spacetime-dependent vacuum energy in cosmology, including inhomogeneous perturbations. We show how any dark energy cosmology can be described by an interacting vacuum+matter. Different models for the interaction can lead to different behaviour (e.g., sound speed for dark energy perturbations) and hence could be distinguished by cosmological observations. As an example we present the cosmic microwave microwave background anisotropies and the matter power spectrum for two different versions of a generalised Chaplygin gas cosmology.