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

It is widely acknowledged that, for formal purposes, a minimally coupledscalar field is equivalent to an effective perfect fluid with equation of statedetermined by the scalar potential. This correspondence is not complete becausethe Lagrangian densities P and -rho, which are equivalent for a perfect fluid,are not equivalent for a minimally coupled scalar field. The exchange betweenthese two Lagrangian densities amounts to exchanging a canonical scalar fieldwith a phantom scalar field.

The correspondence between a scalar field and an effective perfect fluid