Joshua C. Long
B.S., Amherst College 1989
M.S., Johns Hopkins University 1993
Ph.D., Johns Hopkins University 1997
Postdoctoral Positions: University of Colorado (1997-2002)
Office: Swain West 241
Josh Long's research concentrates on experimental tests of particle physics at low energies. One experiment, under construction at the Oak Ridge National Laboratory, is a new search for a permanent electric dipole moment of the neutron (nEDM). An nEDM signal would be an example of time reversal symmetry violation and a key to understanding the matter-antimatter asymmetry in the universe. Another experiment, based at the Indiana University Cyclotron Facility, is a test of the Newtonian inverse square law (ISL) at distance ranges less than 100 microns. Modifications to the ISL at short range, arising from new elementary particles or even extra spacetime dimensions, are predicted from many models that attempt to describe gravity and the other fundamental interactions in the same theoretical framework.
- J. C. Long, P. D. Barnes, J. G. Boissevain, D. J. Clark, M. D. Cooper, J. J. Gomez, S. K. Lamoreaux, R. E. Mischke, S. I. Penttila, "High Voltage Test Apparatus for a Neutron EDM Experiment and Lower Limit on the Dielectric Strength of Liquid Helium at Large Volumes," accepted for publication in Cryogenics; preprint available at physics/0603231.
- P. N. Seo, J. D. Bowman, M. Gericke, G. Greene, J. Long, G. S. Mitchell, S. I. Penttila, W. S. Wilburn, "A measurement of the Flight Path 12 cold H2 moderator brightness at LANSCE," Nucl. Instrum. and Meth. A 517 (2004) 285.
- Joshua C. Long, "Tests of Gravity at the 100 Micron Scale and Below," in Proceedings of the SLAC Summer Institute on Particle Physics (SSI05) , Menlo Park, CA, 2005, ed. J. Hewett, J. Jaros, T. Kamae, C. Prescott.
- Joshua C. Long, Hilton W. Chan, Allison B. Churnside, Eric A. Gulbis, Michael C. M. Varney, John C. Price, "Upper limits to submillimeter--range forces from extra space-time dimensions," Nature 421 (2003) 922-925, preprint available at hep-ph/0210004