Effective inhomogeneous inflation: curvature inhomogeneities of the Einstein vacuum

Abstract

We consider spatially averaged inhomogeneous universe models and argue that, already in the absence of sources, an effective scalar field arises through foliating and spatially averaging inhomogeneous geometrical curvature invariants of the Einstein vacuum. This scalar field (the `morphon') acts as an inflaton, if we prescribe a potential of some generic form. We show that, for any initially negative average spatial curvature, the morphon is driven through an inflationary phase and leads - on average - to a spatially flat, homogeneous and isotropic universe model, providing initial conditions for pre-heating and, by the same mechanism, a possibly natural self-exit.

9 pages, 2 figures, to appear in Class. Quant. Grav. as Fast Track Communication

References in corpus (6)

• The universe seen at different scales
• Correspondence between kinematical backreaction and scalar field cosmologies - the `morphon field'
• Multiscale cosmology and structure-emerging Dark Energy: A plausibility analysis
• On the onset of cosmological backreaction
• Constraints on backreaction in dust universes
• Condensation of Planckian Modes and the Inflaton

Cited by in corpus (6)

• Inhomogeneous vacuum energy
• On general-relativistic Lagrangian perturbation theory and its non-perturbative generalization
• Averaging in cosmology based on Cartan scalars
• Quantum potentiality in Inhomogeneous Cosmology
• Effective Inhomogeneous Cosmologies and Emerging Scalar Fields
• Towards physical cosmology: geometrical interpretation of Dark Energy, Dark Matter and Inflation without fundamental sources