Future stability of the $1+3$ Milne model for Einstein-Klein-Gordon system

Abstract

We study the small perturbations of the $1+3$-dimensional Milne model for the Einstein-Klein-Gordon (EKG) system. We prove the nonlinear future stability, and show that the perturbed spacetimes are future causally geodesically complete. For the proof, we work within the constant mean curvature (CMC) gauge and focus on the $1+3$ splitting of the Bianchi-Klein-Gordon equations. Moreover, we treat the Bianchi-Klein-Gordon equations as evolution equations and establish the energy scheme in the sense that we only commute the Bianchi-Klein-Gordon equations with the spatially covariant derivatives while the normal derivative is not allowed.

arXiv commentThe scale-free variables including the rescaled mass (1.5) for the Klein Gordon field are used to make the estimates uniform (Thanks to the suggestions from an anonymous referee); More reference and remark are added; e.g. Remark 3.10 (P.18) confirms the inevitability of the borderline terms arising in the KG equation

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• Averaging Generalized Scalar Field Cosmologies II: Locally Rotationally Symmetric Bianchi I and flat Friedmann-Lemaître-Robertson-Walker models
• The Stability of Relativistic Fluids in Linearly Expanding Cosmologies
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• Cosmic Censorship near FLRW spacetimes with negative spatial curvature