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arXiv · 2609.10326

Primordial turbulence from inflation: a new inflaton-driven turbulent regime

Oksana Iarygina·Axel Brandenburg
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Abstract

For the first time, we establish a direct connection between inflationary dynamics and the subsequent magnetohydrodynamic evolution. Starting from vacuum fluctuations, we self-consistently evolve the coupled inflaton-plasma system through inflation, reheating, and into the radiation-dominated era. We find an inflaton-driven inverse cascade followed by freely decaying turbulence, with kinetic energy dominating over magnetic energy and driving dynamo amplification. The inflaton-driven turbulence causes steeper magnetic energy decay than helical turbulence and should therefore be accounted for subsequent evolution of primordial fields and their present-day observables.

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Oksana Iarygina, Axel Brandenburg. 2026-09-09. Primordial turbulence from inflation: a new inflaton-driven turbulent regime. https://arxiv.org/abs/2609.10326

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