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

Most theories that predict time and/or space variation of fundamentalconstants also predict violations of the Weak Equivalence Principle (WEP).Khoury and Weltmann proposed the chameleon model in 2004 and claimed that thismodel avoids experimental bounds on WEP. We present a contrasting view based onan approximate calculation of the two body problem for the chameleon field andshow that the force depends on the test body composition. Furthermore, wecompare the prediction of the force on a test body with E\"otv\"os typeexperiments and find that the chameleon field effect cannot account for currentbounds.

Equivalence Principle in Chameleon Models: first approach