TL;DR
This paper investigates how boundary conditions influence the vacuum structure and entropy in quantum field theories, revealing boundary effects as a significant source of information about the vacuum and showing entropy decreases from UV to IR.
Contribution
It introduces a quantum information perspective to analyze boundary effects on vacuum structure and entropy in quantum field theories, highlighting boundary conditions as a novel informational resource.
Findings
Boundary conditions significantly affect boundary and entanglement entropy.
Entropy decreases along the flow from ultraviolet to infrared.
Boundary effects serve as a rich source of vacuum information.
Abstract
The effect of boundary conditions on the vacuum structure of quantum field theories is analysed from a quantum information viewpoint. In particular, we analyse the role of boundary conditions on boundary entropy and entanglement entropy. The analysis of boundary effects on massless free field theories points out the relevance of boundary conditions as a new rich source of information about the vacuum structure. In all cases the entropy does not increase along the flow from the ultraviolet to the infrared.
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