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

Wake patterns due to a uniformly traveling source are a result of theresonant emission of the medium's collective excitations. When there exists afrequency range where such excitations possess a negative group velocity, theirinterference leads to a wake pattern resembling the Kelvin ship wake: whilethere are "transverse" and "divergent" wavefronts trailing the source, they areoriented oppositely to Kelvin's. This is illustrated by an explicit calculationof "roton" wake patterns in superfluid $^{4}He$ where a Kelvin-like wakeemerges when the speed of the source marginally exceeds the Landau criticalroton velocity.

Negative group velocity and Kelvin-like wake pattern