Quantum entanglement in multi-field inflation

Nadia Bolis, Tomohiro Fujita, Shuntaro Mizuno, Shinji Mukohyama

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We study the emergence of quantum entanglement in multi-field inflation. In this scenario, the perturbations of one field contribute to the observable curvature perturbation, while multi-field dynamics with the other fields affect the curvature perturbation through particle production and entanglement. We develop a general formalism which defines the quantum entanglement between the perturbations of the multiple fields both in the Heisenberg and Schrödinger pictures, and show that entanglement between different fields can arise dynamically in the context of multi-field inflationary scenarios. We also present a simple model in which a sudden change in the kinetic matrix of the scalar fields generates entanglement and an oscillatory feature appears in the power spectrum of the inflaton perturbation.

Original languageEnglish
Article number004
JournalJournal of Cosmology and Astroparticle Physics
Issue number9
Publication statusPublished - 2018 Sept 4
Externally publishedYes


  • cosmological perturbation theory
  • inflation
  • transplanckian physics

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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