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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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Cite

BibTeXRIS
BibTeX
@misc{iarygina2026primordial,
  title = {{Primordial turbulence from inflation: a new inflaton-driven turbulent regime}},
  author = {Oksana Iarygina and Axel Brandenburg},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.10326},
  eprint = {2609.10326},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.10326},
}
RIS
TY  - UNPB
TI  - Primordial turbulence from inflation: a new inflaton-driven turbulent regime
AU  - Oksana Iarygina
AU  - Axel Brandenburg
PY  - 2026
DA  - 2026/09/09
PB  - arXiv
DO  - 10.48550/arxiv.2609.10326
UR  - https://arxiv.org/abs/2609.10326
AB  - 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.
ER  -