Experiment to detect frame dragging in a lead superconductor

Graham, Richard D.; Hurst, Robert B.; Thirkettle, Robert J.; Rowe, C. H.; Butler, P. H.

doi:10.1016/j.physc.2007.11.011

Cited by 15 publications

(15 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It might be the easy way to prove the existence of a rest frame agreeing with the CMB. The Graham et al (2008) results can be interpreted as a direct confirmation but there seems to be some dispute on the reality or the interpretation of the measurement (see also Lewis, 2012).…”

Section: Discussionmentioning

confidence: 98%

Minkowski Space and Tachyon Velocity

Consiglio¹

2013

APR

View full text Add to dashboard Cite

A brief analysis of classical tachyons in Minkowski space shows that de Broglie wave phase velocity V = c²/v does not enable causality violations and gives an inversion of energy/momentum ratio between bradyons and tachyons. It leads to considering Vv = c² as a symmetry of Minkowski space where, for V > c, the signature of space-time is seen inverted. The inversion is shown coherent with Cramer’s transactional interpretation of quantum mechanics, but implies the physical existence of the past and the inexistence of the future.

In a recent paper we assume that the electron wave is a magnetic current at the origin of its mass; it leads to reversed coefficients with respect to the Dirac condition. Using space-time signature inversion we show that the monopole has, in linked electrons states, quantized velocities in agreement with the de Broglie wave phase velocity. The magnetic charge is relativistic and quantum in origin and comes from the Lorentz transformation of a quantum of current. We also show that gravitation is a natural consequence of the theory.

The predicted charges agree with experimental results from Ehrenhaft, Schedling, Ferber and Mikhaïlov. They also agree, in phenomenology, with recent results related to symmetry breaking in superconductors, and give plausible kinematics to the emission process in the Podkletlov and Poher experiments.

show abstract

Section: Discussionmentioning

confidence: 98%

Minkowski Space and Tachyon Velocity

Consiglio¹

2013

APR

View full text Add to dashboard Cite

show abstract

“…Also Graham et al [19] attempted to measure enhanced frame-dragging from a rotating lead disc at 4 K using the world's largest ring-laser gyro and failed to detect a signal within 1.7 ± 3.8 × 10 −7 assuming a dipolar distribution, a sensitivity which is about two orders of magnitude worse than our design (their experimental values were re-assessed in [16]) and therefore could not rule out our anomalous gyroscope signals.…”

Section: Introductionmentioning

confidence: 69%

Evaluation of enhanced frame-dragging in the vicinity of a rotating niobium superconductor, liquid helium and a helium superfluid

Tajmar

2011

Supercond. Sci. Technol.

View full text Add to dashboard Cite

Tajmar and de Matos predicted that rotating superconductors or superfluids might produce large non-classical frame-dragging fields in order to explain a reported Cooper-pair mass anomaly in niobium. Also anomalous gyroscope signals close to the measurement resolution in the proximity of rotating superconductors or liquid helium were reported while trying to investigate this theoretical concept. Based on lessons from various setups, we succeeded in building an experimental facility that allowed us to rotate a niobium superconductor, liquid helium, superfluid helium and low temperature matter with high accelerations at high speed exceeding all previous efforts. A military-grade SRS-1000 gyroscope at close proximity in different locations was used to measure any anomalous frame-dragging-like fields. No such anomalies were found within three times the noise level of our setup (±5 × 10 −8 rad/s). Measurements with an electric motor at speeds up to 5000 RPM enabled us to set low boundaries for any coupling or frame-dragging-like effect outside of a rotating niobium superconductor or liquid helium to 4 × 10 −11 and for superfluids to 3 × 10 −10. Due to the high speeds used, these results are up to two orders of magnitude below any previous result.

show abstract

“…These measurements have been repeated at the ring laser gyroscope in Christchurch, New Zealand. No such effects have been seen [30]. There is also the claim that the observed effect might explain the misalignment torques in the GP-B experiment.…”

Section: Test Of General Relativitymentioning

confidence: 89%

Summary of session C1: experimental gravitation

Lämmerzahl

2008

Class. Quantum Grav.

View full text Add to dashboard Cite

The fact that gravity is a metric theory follows from the Einstein equivalence principle. This principle consists of (i) the universality of free fall, (ii) the universality of the gravitational redshift and (iii) the local validity of Lorentz invariance. Many experiments searching for deviations from standard general relativity test the various aspects of the Einstein equivalence principle. Here we report on experiments covering the whole Einstein equivalence principle. Until now all experiments have been in agreement with the Einstein equivalence principle. As a consequence, gravity has to be described by a metric theory. Any metric theory of gravity leads to effects such as perihelion shift, deflection of light, gravitational redshift, gravitational time delay, Lense-Thirring effect, Schiff effect, etc. A particular theory of that sort is Einstein's general relativity. For weak gravitational fields which are asymptotically flat any deviation from Einstein's general relativity can be parametrized by a few constants, the PPN parameters. Many astrophysical observations and space experiments are devoted to a better measurement of the effects and, thus, of the PPN parameters. It is clear that gravity is best tested for intermediate ranges, that is, for distances between 1 m and several astronomical units. It is highly interesting to push forward our domain of experience and to strengthen the experimental foundation of gravity also beyond these scales. This point is underlined by the fact that many quantum gravity and unification-inspired theories suggest deviation from the standard laws of gravity at very small or very large scales. In this session summary we briefly outline the status and report on the talks presented in session C1 about experimental gravitation.

show abstract

Experiment to detect frame dragging in a lead superconductor

Cited by 15 publications

References 13 publications

Minkowski Space and Tachyon Velocity

Minkowski Space and Tachyon Velocity

Evaluation of enhanced frame-dragging in the vicinity of a rotating niobium superconductor, liquid helium and a helium superfluid

Summary of session C1: experimental gravitation

Contact Info

Product

Resources

About