title: Bound on Lorentz and CPT violating boost effects for the neutron.
abstract: A search for an annual variation of a daily sidereal modulation of the frequency difference between colocated 129Xe and 3He Zeeman masers 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, the present 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.
authors.affiliation: Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA.
authors.forename: F
authors.initials: F
authors.lastname: Canè
authors.forename: D
authors.initials: D
authors.lastname: Bear
authors.forename: D F
authors.initials: DF
authors.lastname: Phillips
authors.forename: M S
authors.initials: MS
authors.lastname: Rosen
authors.forename: C L
authors.initials: CL
authors.lastname: Smallwood
authors.forename: R E
authors.initials: RE
authors.lastname: Stoner
authors.forename: R L
authors.initials: RL
authors.lastname: Walsworth
authors.forename: V Alan
authors.initials: VA
authors.lastname: Kostelecký