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

We point out that theories of cosmological acceleration which have equationof state, w, such that 1+w is small but positive may still secretly violate thenull energy condition. This violation implies the existence of observers forwhom the background has infinitely negative energy densities, despite the factthat the perturbations are free of ghosts and gradient instabilities.

Hidden Negative Energies in Strongly Accelerated Universes