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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The Dirac hydrogen atom with spin symmetry is shown has a SO(4) symmetry. Thegenerators are derived, and the corresponding Casimir operator leads to theenergy spectrum naturally. This type hydrogen atom is connected to afour-dimensional Dirac system with equal scalar and vector harmonic oscillatorpotential, by the Kustaanheimo-Stiefel transformation with a constraint.

Dynamical symmetry of Dirac hydrogen atom with spin symmetry and its connection with Ginocchio's oscillator