Vacuum state in de Sitter spacetime with static charts

Atsushi Higuchi, Kazuhiro Yamamoto

研究成果: Contribution to journalArticle査読

5 被引用数 (Scopus)


We study the free massive scalar field in de Sitter spacetime with static charts. In particular, we find positive-frequency modes for the Bunch-Davies vacuum state natural to the static charts as superpositions of the well-known positive-frequency modes in the conformally-flat chart. We discuss in detail how these modes are defined globally in the two static charts and the region in their future. The global structure of these solutions leads to the well-known description of the Bunch-Davies vacuum state as an entangled state. Our results are expected to be useful not only for studying the thermal properties in the vacuum fluctuations in de Sitter spacetime but also for understanding the nonlocal properties of the vacuum state.

ジャーナルPhysical Review D
出版ステータス出版済み - 9 25 2018

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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