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 equivalence principle (EP), as well as Schiff's conjecture, are discussed(en passant), and the connection between the EP and quantum mechanics is thenbriefly analyzed. Two semiclassical violations of the classical equivalenceprinciple (CEP) but not of the weak one (WEP), i.e. Greenberger gravitationalBohr atom and the tree-level scattering of different quantum particles by anexternal weak higher-order gravitational field, are thoroughly investigatedafterwards. Next, two quantum examples of systems that agree with the WEP butnot with the CEP, namely COW experiment and free fall in a constantgravitational field of a massive object described by its wave-function $\Psi$,are discussed in detail. Keeping in mind that among the four examples focusedon this work only COW experiment is based on an experimental test, someimportant details related to it, are presented as well.

Interesting examples of violation of the classical equivalence principle but not of the weak one