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First results on the search for chameleons with the KWISP detector at CAST
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
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Number of Authors: 532019 (English)In: Physics of the Dark Universe, ISSN 0953-8585, E-ISSN 2212-6864, Vol. 26, article id 100367Article in journal (Refereed) Published
Abstract [en]

We report on a first measurement with a sensitive opto-mechanical force sensor designed for the direct detection of coupling of real chameleons to matter. These dark energy candidates could be produced in the Sun and stream unimpeded to Earth. The KWISP detector installed on the CAST axion search experiment at CERN looks for tiny displacements of a thin membrane caused by the mechanical effect of solar chameleons. The displacements are detected by a Michelson interferometer with a homodyne readout scheme. The sensor benefits from the focusing action of the ABRIXAS X-ray telescope installed at CAST, which increases the chameleon flux on the membrane. A mechanical chopper placed between the telescope output and the detector modulates the incoming chameleon stream. We present the results of the solar chameleon measurements taken at CAST in July 2017, setting an upper bound on the force acting on the membrane of 80 pN at 95% confidence level. The detector is sensitive for direct coupling to matter 104 <= beta(m) <= 108, where the coupling to photons is locally bound to beta(gamma) <= 10(11).

Place, publisher, year, edition, pages
2019. Vol. 26, article id 100367
Keywords [en]
Chameleons, Dark energy, Opto-mechanical sensor, Interferometry
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-177635DOI: 10.1016/j.dark.2019.100367ISI: 000499696200021OAI: oai:DiVA.org:su-177635DiVA, id: diva2:1384607
Available from: 2020-01-10 Created: 2020-01-10 Last updated: 2020-01-10Bibliographically approved

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Baum, SebastianOzbey, A.
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)Nordic Institute for Theoretical Physics (Nordita)
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