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T: Fachverband Teilchenphysik
T 34: Axionen I
T 34.6: Talk
Tuesday, March 26, 2019, 17:15–17:30, S09
Search for hidden-photon dark matter with FUNK — •Arnaud Andrianavalomahefa1, Kai Daumiller1, Ralph Engel1, Hermann-Josef Mathes1, Markus Roth1, Christoph M. Schäfer1, Thomas Schwetz-Mangold1, Ralf Ulrich1, Darko Veberic1, Babette Döbrich2, Joerg Jaeckel3, Axel Lindner4, Marek Kowalski4,5, and Javier Redondo6 — 1Institute for Nuclear Physics, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany — 2Physics Department, CERN, Geneva, Switzerland — 3Institute for Theoretical Physics, Heidelberg University, Germany — 4Deutsches Elektronen Synchrotron (DESY), Zeuthen, Germany — 5Department of Physics, Humboldt University, Berlin, Germany — 6Department of Theoretical Physics, University of Zaragoza, Spain
The FUNK experiment was built to search for hidden and light U(1) gauge force carriers, named hidden photons, which are suitable candidates for cold dark matter. At low energies, these photons with small mass couple dominantly with regular photons via a weak kinetic mixing. As an immediate consequence, when propagating across two different dielectric media a certain probability exists that the dark-matter field emits a faint but measurable ordinary electric field. The FUNK experiment uses a large spherical mirror to capture this conversion. A photomultiplier tube is installed at the radius point where the signal is expected. We scanned the whole optical range of frequencies extended to far-UV and looked for hidden photons with masses from 2 to 8 eV. In this region we found no significant evidence of hidden-photon dark-matter but set an upper bound on the mixing parameter to 10−12.