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dc.contributor.authorLi, Ke
dc.contributor.authorArif, Muhammad
dc.contributor.authorCory, David G.
dc.contributor.authorHaun, Robert
dc.contributor.authorHeacock, Benjamin
dc.contributor.authorHuber, Michael G.
dc.contributor.authorNsofini, Joachim
dc.contributor.authorPushin, Dimitry A.
dc.contributor.authorSaggu, Parminder
dc.contributor.authorSarenac, Dusan
dc.contributor.authorShahi, Chandra B.
dc.contributor.authorSkavysh, Vladimir
dc.contributor.authorSnow, W. Michael
dc.contributor.authorYoung, Albert R. 19:41:16 (GMT) 19:41:16 (GMT)
dc.description© 2016 American Physical Society,
dc.description.abstractThe physical origin of the dark energy that causes the accelerated expansion rate of the Universe is one of the major open questions of cosmology. One set of theories postulates the existence of a self-interacting scalar field for dark energy coupling to matter. In the chameleon dark energy theory, this coupling induces a screening mechanism such that the field amplitude is nonzero in empty space but is greatly suppressed in regions of terrestrial matter density. However measurements performed under appropriate vacuum conditions can enable the chameleon field to appear in the apparatus, where it can be subjected to laboratory experiments. Here we report the most stringent upper bound on the free neutron-chameleon coupling in the strongly coupled limit of the chameleon theory using neutron interferometric techniques. Our experiment sought the chameleon field through the relative phase shift it would induce along one of the neutron paths inside a perfect crystal neutron interferometer. The amplitude of the chameleon field was actively modulated by varying the millibar pressures inside a dual-chamber aluminum cell. We report a 95% confidence level upper bound on the neutron-chameleon coupling beta ranging from beta < 4.7 x 10(6) for a Ratra-Peebles index of n = 1 in the nonlinear scalar field potential to beta < 2.4 x 10(7) for n = 6, one order of magnitude more sensitive than the most recent free neutron limit for intermediate n. Similar experiments can explore the full parameter range for chameleon dark energy in the foreseeable future.en
dc.description.sponsorshipNational Institute of Standards and Technologyen
dc.description.sponsorshipU.S. Department of Commerceen
dc.description.sponsorshipNational Science Foundation: PHY-1068712, NSF PHY-1205342, PHY-1307426en
dc.description.sponsorshipU.S. Department of Energy: DE-FG02-97ER41042en
dc.description.sponsorshipCanada Excellence Research Chairs, Government of Canadaen
dc.description.sponsorshipNSERC CREATEen
dc.description.sponsorshipIndiana University Center for Spacetime Symmetriesen
dc.description.sponsorshipIndiana University Faculty Research Support Programen
dc.publisherAmerican Physical Societyen
dc.titleNeutron limit on the strongly-coupled chameleon fielden
dcterms.bibliographicCitationLi, K., Arif, M., Cory, D. G., Haun, R., Heacock, B., … Huber, M. G. (2016). Neutron limit on the strongly-coupled chameleon field. Physical Review D, 93(6). doi:10.1103/physrevd.93.062001en
uws.contributor.affiliation1Faculty of Scienceen
uws.contributor.affiliation2Physics and Astronomyen

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