Entanglement negativity in the multiverse

Sugumi Kanno, Jonathan P. Shock, Jiro Soda

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


We explore quantum entanglement between two causally disconnected regions in the multiverse. We first consider a free massive scalar field, and compute the entanglement negativity between two causally separated open charts in de Sitter space. The qualitative feature of it turns out to be in agreement with that of the entanglement entropy. We then introduce two observers who determine the entanglement between two causally disconnected de Sitter spaces. When one of the observers remains constrained to a region of the open chart in a de Sitter space, we find that the scale dependence enters into the entanglement. We show that a state which is initially maximally entangled becomes more entangled or less entangled on large scales depending on the mass of the scalar field and recovers the initial entanglement in the small scale limit. We argue that quantum entanglement may provide some evidence for the existence of the multiverse.

Original languageEnglish
Article number015
JournalJournal of Cosmology and Astroparticle Physics
Issue number3
Publication statusPublished - Mar 10 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics


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