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

The notion that the metric field in general relativity can be understood as aproperty of space-time rests on a feature of the theory sometimes calleduniversal coupling -- the claim that rods and clocks "measure" the metric in away that is independent of their constitution. It is pointed out that thisfeature is not strictly a consequence of the central dynamical tenets of thetheory, and argued that the metric field would better be regarded as a(possibly emergent) field in space-time, rather than as the very fabric ofspace-time itself.

The behaviour of rods and clocks in general relativity, and the meaning of the metric field