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

Recent data on cosmological variation of the electromagnetic fine structureconstant from distant quasar (QSO) absorption spectra have inspired a moregeneral discussion of possible variation of other constants. We discussvariation of strong scale and quark masses. We derive the limits on theirrelative change from (i) primordial Big-Bang Nucleosynthesis (BBN); (ii)  Oklo natural nuclear reactor, (iii) quasar absorption spectra, and (iv)laboratory measurements of hyperfine intervals.Comment: 10 pages 2 figurs: second version have several references added and  some new comment

Limits on cosmological variation of strong interaction and quark masses from big bang nucleosynthesis, cosmic, laboratory and Oklo data