Benmessai, Karim, Tobar, Michael Edmund, Bazin, Nicholas, Bourgeois, Pierre-Yves, Kersale, Yann, Giordano, Vincent
We report observations of the gyrotropic change in magnetic susceptibility of the Fe$^{3+}$ electron paramagnetic resonance at 12.037GHz (between spin states $|1/2>$ and $|3/2>$) in sapphire with...
Microwave Phase Detection at the Level of $10^{-11}$ rad (2009)
Ivanov, Eugene Nicolay, Tobar, Michael Edmund
We report on a noise measurement system with the highest spectral resolution ever achieved in the microwave domain. It is capable of detecting the phase fluctuations of $rms$ amplitude of...
Tobar, Michael Edmund, Suzuki, Toshikazu, Kuroda, Kazuaki
In this paper we show that information on both the differential and common mode free-mass response to a gravitational wave can provide important information on discriminating the direction of the...
Benmessai, Karim, Creedon, Daniel Lloyd, Tobar, Michael Edmund, Bourgeois, Pierre-Yves, Kersale, Yann, Giordano, Vincent
We report observations of the Schawlow-Townes noise limit in a cryogenic sapphire secondary frequency standard. The effect causes a fundamental limit to the frequency stability, and was measured...
Relativity tests by complementary rotating Michelson-Morley experiments (2007)
Mueller, Holger, Stanwix, Paul Louis, Tobar, Michael Edmund, Ivanov, Eugene, Wolf, Peter, Herrmann, Sven, ...
We report Relativity tests based on data from two simultaneous Michelson-Morley experiments, spanning a period of more than one year. Both were actively rotated on turntables. One (in Berlin,...
Erratum: New methods of testing Lorentz violation in electrodynamics (2007)
Hohensee, Michael, Glenday, Alex, Li, Chih-Hao, Tobar, Michael Edmund, Wolf, Peter
In an earlier paper [1] (hep-ph/0408006), the bound on the Standard Model Extension photon-sector parameter $\tilde{\kappa}_{tr}$ [2] (hep-ph/0205211) set by the heavy-ion storage-ring experiment of...
Global Representation of the Fine Structure Constant and its Variation (2003)
The fine structure constant, alpha, is shown to be proportional to the ratio of the quanta of electric and magnetic flux of force of the electron, and provides a new representation, which is global...
Tobar, Michael Edmund, Hartnett, John Gideon
A new experiment to test for the time independence of the fine structure constant, alpha, is proposed. The experiment utilizes orthogonally polarized Transverse Electric and Transverse Magnetic...
Tobar, Michael Edmund, Hartnett, John Gideon, Anstie, James David
A new Michelson-Morley experiment is proposed by measuring the beat frequency of two near degenerate modes with orthogonal propagation in a single spherical resonator. The unique properties of the...