# Neutron Interferometry constrains dark energy chameleon fields

Abstract : We present phase shift measurements for neutron matter waves in vacuum and in low pressure Helium using a method originally developed for neutron scattering length measurements in neutron interferometry. We search for phase shifts associated with a coupling to scalar fields. We set stringent limits for a scalar chameleon field, a prominent quintessence dark energy candidate. We find that the coupling constant $\beta$ is less than 1.9 $\times10^7$~for $n=1$ at 95\% confidence level, where $n$ is an input parameter of the self--interaction of the chameleon field $\varphi$ inversely proportional to $\varphi^n$.
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Submitted on : Friday, February 27, 2015 - 8:26:28 AM
Last modification on : Monday, December 13, 2021 - 9:16:04 AM

### Citation

H. Lemmel, Philippe Brax, A. N. Ivanov, T. Jenke, G. Pignol, et al.. Neutron Interferometry constrains dark energy chameleon fields. Physics Letters B, Elsevier, 2015, 743, pp.310-314. ⟨10.1016/j.physletb.2015.02.063⟩. ⟨in2p3-01120940⟩

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