Neutron Interferometry constrains dark energy chameleon fields

20 Feb 2015  ·  Lemmel H., Brax Ph., Ivanov A. N., Jenke T., Pignol G., Pitschmann M., Potocar T., Wellenzohn M., Zawisky M., Abele H. ·

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 $\varphi^n$. read more

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