2026-09-18T21:12:18Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/346482026-06-11T12:45:12Zcom_1721.1_7582com_1721.1_7581col_1721.1_131022
Ronald L. Walsworth and Daniel Kleppner.
Canè, Federico
Massachusetts Institute of Technology. Dept. of Physics.
Massachusetts Institute of Technology. Department of Physics
2008-03-26T20:35:43Z
2008-03-26T20:35:43Z
2006
2006
http://hdl.handle.net/1721.1/34648
70160360
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2006.
Includes bibliographical references (p. 271-276).
We report on a search for an annual variation of a daily sidereal modulation of the frequency difference between co-located ¹²⁹Xe and ³He Zeeman masers that sets a stringent limit on boost-dependent Lorentz and CPT violation involving the neutron, consistent with no effect at the level of 150 nHz. In the framework of the general Standard-Model Extension, our result provides the first clean test for the fermion sector of the symmetry of spacetime under boost transformations at a level of 10-27 GeV [1]. We also report progress on the optimization and operation of the Harvard-Smithsonian ¹²⁹Xe/³He dual noble gas maser. The ¹²⁹Xe/³He maser is the first device to sustain simultaneous active maser oscillations on distinct transitions in two intermingled atomic species, and it allows sensitive differential measurement of the ¹²⁹Xe and ³He nuclear spin-1/2 Zeeman transition frequencies [2, 3, 4]. The optimized ¹²⁹Xe /³He maser will be used for highly sensitive tests of Lorentz and CPT symmetry.
by Federico Canè.
Ph.D.
276 p.
eng
Massachusetts Institute of Technology
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http://dspace.mit.edu/handle/1721.1/7582
Physics.
Progress towards an optimized ¹²⁹Xe / ³He Zeeman maser and a test of boost symmetry
Thesis
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<Abstract>We report on a search for an annual variation of a daily sidereal modulation of the frequency difference between co-located ¹²⁹Xe and ³He Zeeman masers that sets a stringent limit on boost-dependent Lorentz and CPT violation involving the neutron, consistent with no effect at the level of 150 nHz. In the framework of the general Standard-Model Extension, our result provides the first clean test for the fermion sector of the symmetry of spacetime under boost transformations at a level of 10-27 GeV [1]. We also report progress on the optimization and operation of the Harvard-Smithsonian ¹²⁹Xe/³He dual noble gas maser. The ¹²⁹Xe/³He maser is the first device to sustain simultaneous active maser oscillations on distinct transitions in two intermingled atomic species, and it allows sensitive differential measurement of the ¹²⁹Xe and ³He nuclear spin-1/2 Zeeman transition frequencies [2, 3, 4]. The optimized ¹²⁹Xe /³He maser will be used for highly sensitive tests of Lorentz and CPT symmetry.</Abstract>
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