2010/01/31 by Shih-Yuin Lin, Chung-Hsien Chou, B. L. Hu · 1 citation
Physics and Astronomy · #Cosmology and Gravitation Theories #Quantum Electrodynamics and Casimir Effect #Quantum Mechanics and Applications #gr-qc #quant-ph
paper · pdf · doi:10.1103/physrevd.81.084018
published as Phys.Rev.D81:084018,2010 · 14 pages, no figure; Typos corrected.
openalex publication_date 2010/04/12 · arxiv created 2010/04/30 · arxiv updated 2010/05/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We investigate the basic theoretical issues in the quantum entanglement of particle pairs created from the vacuum in a time-dependent background field or spacetime. Similar to entropy generation from these processes which depends on the choice of physical variables and how certain information is coarse grained, entanglement dynamics hinges on the choice of measurable quantities and how the two parties are selected as well as the background dynamics of the field or spacetime. We discuss the conditions of separability of quantum states in particle creation processes and point out the differences in how the von Neumann entropy is used as a measure of entropy generation versus for entanglement dynamics. We show by an explicit construction that adoption of a different set of physical variables yields a different entanglement entropy. As an application of these theoretical considerations we show how the particle number and the quantum phase enter the entanglement dynamics in cosmological particle production.