Bulletin of the American Physical Society
APS April Meeting 2016
Volume 61, Number 6
Saturday–Tuesday, April 16–19, 2016; Salt Lake City, Utah
Session B6: Laboratory Searches for Dark Energy Scalar Fields
10:45 AM–12:33 PM,
Saturday, April 16, 2016
Sponsoring Unit: GPMFC
Abstract ID: BAPS.2016.APR.B6.3
Abstract: B6.00003 : Neutron Limit on the Strongly-Coupled Chameleon Field*
11:57 AM–12:33 PM
(University of Waterloo)
One of the major open questions of cosmology is the physical origin of the dark energy. There are a few sets of theories which might explain this origin that could be tested experimentally. The chameleon dark energy theory postulates self-interacting scalar field that couples to matter. This coupling induces a screening mechanism chosen so that the field amplitude is nonzero in empty space but is greatly suppressed in regions of terrestrial matter density. On behalf of the INDEX collaboration, I will 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. In our experiment we measure neutron phase induced by chameleon field. We report a $95\%$ confidence level upper bound on the neutron-chameleon coupling ranging from $\beta<4.7\times 10^6$ for a Ratra-Peebles index of $n = 1$ in the nonlinear scalar field potential to $\beta < 2.4\times 10^7$ for $n = 6$, one order of magnitude more sensitive than the most recent free neutron limit for intermediate n.
*This work was supported by NIST; NSF grants: PHY-1205342, PHY-1068712, PHY-1307426; DOE award DE-FG02-97ER41042; NSERC CREATE and DISCOVERY programs; CERC; IUCSS and IU FRS program.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2016.APR.B6.3
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