Abstract
Abstract Chameleons can play a role in the recent acceleration of the expansion of the Universe. We present results where chameleon fields modify the terrestrial gravitational potential above a mirror and lead to a small perturbation of the energy levels of the neutrons in experimental setups such as GRANIT in Grenoble. With the current sensitivity, these experiments probe chameleon fields in a large coupling to matter regime. We also comment on the possibility of testing chameleon fields with neutron interferometry.
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