A space-based superconducting microwave oscillator clock

Clock-Comparison Tests of Lorentz andCPTSymmetry in Space

“…We focus next on the special case where the orbiting platform is the ISS, for which b s Ӎ 3 3 10 25 and z Ӎ 52 ± . Among the instruments planned for flight on the ISS are H masers, laser-cooled Cs and Rb clocks, and superconducting microwave cavity oscillators [21][22][23][24]. We provide here a simplified theoretical analysis, applicable to possible Lorentz tests with all except the oscillators, which are discussed elsewhere [25].…”

Optical cavity tests of Lorentz invariance for the electron

“…In a Fourier analysis of a sufficiently long timetrace, the Fourier components can be resolved and individual limits on almost all components of c µν (only c 00 does not lead to time-dependent signals to first order in β ⊕ or β L ) can be expected, at or below about a part in 10 15 for the dominating parameters and to about a part in 10 11 for the parameters that are suppressed by β ⊕ . Future space experiments, for which a resolution of the frequency measurement of up to 10 −18 is projected [20,21], might bound the dominating components of E ′ jk at the 10 −18 level, and the suppressed components of c µν at the 10 −14 level. Instead of using different cavity materials, two cavities made from the same crystalline material, but having different orientations of the cavities with respect to the crystal axes might be used.…”

Testing Lorentz invariance by the use of vacuum and matter filled cavity resonators

“…Silicon, with B = 5.77, is available in ultra-pure specimens and has a zero crossing of the thermal expansion coefficient. It has therefore been considered for future tests [19]. The same might hold for other semiconductors, such as Ge and GaAs.…”