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 consider the potential detection of chameleons using bouncing ultracoldneutrons. We show that the presence of a chameleon field over a planar platewould alter the energy levels of ultra cold neutrons in the terrestrialgravitational field. When chameleons are strongly coupled to nuclear matter,$\beta\gtrsim 10^8$, we find that the shift in energy levels would bedetectable with the forthcoming GRANIT experiment, where a sensitivity of orderone percent of a peV is expected. We also find that an extremely large coupling$\beta\gtrsim 10^{11}$ would lead to new bound states at a distance of order 2microns, which is already ruled out by previous Grenoble experiments. Theresulting bound, $\beta\lesssim 10^{11}$, is already three orders of magnitudebetter than the upper bound, $\beta\lesssim 10^{14}$, from precision tests ofatomic spectra.

Strongly Coupled Chameleons and the Neutronic Quantum Bouncer