Web Design Dimension and Adaptation

Atomic and optical tests of Lorentz symmetry

“…An experiment at the University of Western Australia involves two cryogenic sapphire oscillators, rotated about the vertical axis with a period of 18 seconds. By taking data over a time scale of about one year, measurements have been made of all eight independentκ e− andκ o+ components without any non-cancelation assumptions [49]. A second experiment by this group at the University of Western Australia consists of a Mach-Zehnder microwave interferometer mounted on a rotating platform.…”

“…A second experiment by this group at the University of Western Australia consists of a Mach-Zehnder microwave interferometer mounted on a rotating platform. After completion of the development stages, it is expected to measureκ tr at competitive levels [49].…”

Rotating Resonator-Oscillator Experiments to Test Lorentz Invariance in Electrodynamics

“…Thus, both κ e+ and κ o− are set to zero each time they appear in our equations. Also, κ tr is a scalar, which resonator experiments are usually insensitive to [24], and is not considered in this work.…”

“…Thus, the final term in (25) will be zero since the electric and magnetic fields are orthogonal in a resonant structure. By equating (23) and (25) in the resonator frame the (M DB ) jk res coefficients are calculated to be zero, eliminating the possibility of making a measurement of κ tr [24,26]. Assuming the resonator permeability and permittivity have no off-diagonal coefficients (i.e.…”

“…In the photon sector of the SME 10 independent components ofκ e+ andκ o− have been constrained by astronomical measurements to < 2 × 10 −32 [7,23]. Seven components ofκ e− andκ o+ have been constrained in optical and microwave cavity experiments [10,13] at the 10 −15 and 10 −11 level respectively, while the scalarκ tr component recently had an upper limit set of < 10 −4 [24]. The remainingκ ZZ e− component could not be previously constrained in nonrotating experiments [10,13].…”