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/

Zendy Open

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Einstein, when he began working on the general theory of relativity, believedthat energy of any kind is the source of the gravitational field. Therefore,the energy of gravity, like any energy, must be the source of the field. It waspreviously discovered that the energy-momentum tensor of the gravitationalfield is already contained in the Ricci tensor. This hypothesis is used toconstruct a new equation of the gravitational field.

The gravitational field energy momentum tensor in the Einstein equation. Construction of the gravitational field equation