Scalar modes and the linearized Schwarzschild solution on a quantized FLRW space-time in Yang-Mills matrix models

Abstract

We study scalar perturbations of a recently found 3+1-dimensional FLRW quantum space-time solution in Yang-Mills matrix models. In particular, the linearized Schwarzschild metric is obtained as a solution. It arises from a quasi-static would-be massive graviton mode, and slowly decreases during the cosmic expansion. Along with the propagating graviton modes, this strongly suggests that 3+1 dimensional (quantum) gravity emerges from the IKKT matrix model on this background. For the dynamical scalar modes, non-linear effects must be taken into account. We argue that they lead to non-Ricci-flat metric perturbations with very long wavelengths, which would be perceived as dark matter from the GR point of view.

25+10 pages, 1 figure. V2: minor changes, published version. V3: minor corrections

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• Four-dimensional Gravity on a Covariant Noncommutative Space
• Higher-spin gravity and torsion on quantized space-time in matrix models
• Complex Langevin analysis of the spontaneous breaking of 10D rotational symmetry in the Euclidean IKKT matrix model
• Fermions on curved backgrounds of matrix models
• One-loop effective action and emergent gravity on quantum spaces in the IKKT matrix model
• Exploring the gravity sector of emergent higher-spin gravity: effective action and a solution