English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

This study aims to construct a theoretical formulation of a nonequilibriumprocess for a system of Bose--Einstein condensate associated with a spontaneoussymmetry breakdown. For this, Thermo Field Dynamics is used. We then describethe most general forms of a 4x4 transformation and an unperturbed Hamiltonian.After calculating the $4\times 4$ self-energy and identifying its on-shell, weimpose the renormalization condition in which the entire on-shell self-energyshould vanish. This condition provides a sufficient number of independentequations to determine all of the parameters in an unperturbed Hamiltonian,among which the quantum transport equations for normal and anomalous numberdistributions are included.

Nonequilibrium Thermo Field Dynamics Using 4x4-Matrix Transformation for System with Bose--Einstein Condensation