Gravitomagnetic field of a rotating superconductor and of a rotating superfluid

Tajmar, Martin; Matos, Clovis Jacinto de

doi:10.1016/s0921-4534(02)02305-5

Cited by 49 publications

(51 citation statements)

References 18 publications

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“…For Niobium we get B g =3.9×10 -6 .ω rad.s -1 at T=0 K. This is nearly two orders of magnitude below a recently published conjecture by one of the authors, that a non-classical gravitomagnetic field could be responsible for a reported disagreement between the theoretically predicted and measured Cooper-pair mass of a rotating Niobium ring (Tajmar and de Matos, 2003;2006b). Although the values for the gravitomagnetic London moment are predicted to be small, compared to classical gravitomagnetic fields, e.g.…”

Section: Introductionmentioning

confidence: 49%

Measurement of Gravitomagnetic and Acceleration Fields around Rotating Superconductors

Plesescu

Seifert

Marhold

2007

AIP Conference Proceedings

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Abstract.It is well known that a rotating superconductor produces a magnetic field proportional to its angular velocity. The authors conjectured earlier, that in addition to this so-called London moment, also a large gravitomagnetic field should appear to explain an apparent mass increase of Niobium Cooper-pairs. A similar field is predicted from Einstein's general relativity theory and the presently observed amount of dark energy in the universe. An experimental facility was designed and built to measure small acceleration fields as well as gravitomagnetic fields in the vicinity of a fast rotating and accelerating superconductor in order to detect this so-called gravitomagnetic London moment. This paper summarizes the efforts and results that have been obtained so far. Measurements with Niobium superconductors indeed show first signs which appear to be within a factor of 2 of our theoretical prediction. Possible error sources as well as the experimental difficulties are reviewed and discussed. If the gravitomagnetic London moment indeed exists, acceleration fields could be produced in a laboratory environment.

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Section: Introductionmentioning

confidence: 49%

Measurement of Gravitomagnetic and Acceleration Fields around Rotating Superconductors

Plesescu

Seifert

Marhold

2007

AIP Conference Proceedings

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“…In [51], Peng and Torr investigated the coupling of gravitational waves to superconductors, while Speliotopoulos found a cross-coupling term between the electromagnetic and gravitational field in the long-wavelength approximation, which could lead to a conversion between the two fields [52]. Tajmar and de Matos considered a classical coupling between electromagnetic and gravitoelectromagnetic waves 4 [53,54], which, however, would lead to a very small interaction strength (cf. Sect.…”

Section: Generation and Detection Of Gravitational Waves Via Quantum mentioning

confidence: 99%

“…The idea of Tajmar and de Matos [54,95] is the combination of two effects: the consideration of the London moment as well as the gravitomagnetic field caused by the rotation of a superconducting mass. To this end, they consider a superconductor rotated about its axis and include gravitational drag effects.…”

Section: Currently Proposed Experimentsmentioning

confidence: 99%

“…Tajmar and de Matos suggest extending the Josephson current which is measured to include the gravitomagnetic field B g [54]; however, the field which would be needed in order to strongly influence the experiment is very large. Again, there is no reason why it should be so based on the present knowledge about the coupling strength between quantum fluids and gravitational fields.…”

Section: Currently Proposed Experimentsmentioning

confidence: 99%

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On the interaction of mesoscopic quantum systems with gravity

Kiefer¹,

Weber

2005

Ann. Phys.

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We review the different aspects of the interaction of mesoscopic quantum systems with gravitational fields. We first discuss briefly the foundations of general relativity and quantum mechanics. Then, we consider the non-relativistic expansions of the Klein-Gordon and Dirac equations in the post-Newtonian approximation. After a short overview of classical gravitational waves, we discuss two proposed interaction mechanisms: (i) the use of quantum fluids as generator and/or detector of gravitational waves in the laboratory, and (ii) the inclusion of gravitomagnetic fields in the study of the properties of rotating superconductors. The foundations of the proposed experiments are explained and evaluated. Quantum theory and the gravitational fieldIn this introductory section we shall give a brief review of the relation between quantum theory and gravity. For more details and references we refer to [1].The gravitational interaction is distinguished by the fact that it interacts universally with all forms of energy. It dominates on large scales (relevant for cosmology) and for compact objects (such as neutron stars and black holes). All presently known features of gravitational physics are successfully described by the theory of general relativity (GR), accomplished by Albert Einstein in 1915.1 In this theory, gravity is not interpreted as a force acting on space and in time, but as a representation of the geometry of spacetime. This is a consequence of the equivalence principle stating the (local) equivalence of free fall with the gravity-free case. Mass generates curvature which in turn acts back on the mass. Curvature can also exist in vacuum; for example, it can propagate with the speed of light in the form of gravitational waves. In contrast to other physical theories, spacetime in GR plays a dynamical role and not the role of a rigid background structure.Experimentally, GR is a very successful theory [4]. Particularly impressive examples are the observations of the double pulsar PSR 1913+16 by which the existence of gravitational waves has been verified indirectly. Many interferometers on Earth are now in operation with the goal of direct observations of these waves. This would open a new window to the universe ('gravitational-wave astronomy'). After 40 years of preparation, the ambitious satellite project Gravity-Probe B was launched in April 2004 in order to observe the 'Thirring-Lense effect' predicted by GR. This effect states that a rotating mass (here the Earth) forces local inertial systems in its neighbourhood to rotate with respect to far-away objects. GR has also entered everyday life in the form of the global positioning system GPS; without the implementation of GR, inaccuracies in the order of kilometres would easily arise over the time span of days [5]. A recent survey of GR tests in space can be found in [6] and the references therein. * Corresponding author: e-mail: kiefer@thp.uni-koeln.de 1 Exceptions may be the Pioneer anomaly [2] and the rotation curves of galaxies [3], which could in principle d...

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“…• Experimentally explore gravitomagnetic fields in quantum materials [48]. Opportunities for continued research clearly exist on any of these options.…”

Section: Tests Of Podkletnov Claimmentioning

confidence: 99%

Prospects for breakthrough propulsion from physics

Millis

Proceedings. 2004 NASA/DoD Conference on Evolvable Hardware, 2004.

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Gravitomagnetic field of a rotating superconductor and of a rotating superfluid

Abstract: The quantization of the extended canonical momentum in quantum materials including the effects of gravitational drag is applied successively to the case of a multiply connected

Cited by 49 publications

References 18 publications

Measurement of Gravitomagnetic and Acceleration Fields around Rotating Superconductors

Measurement of Gravitomagnetic and Acceleration Fields around Rotating Superconductors

On the interaction of mesoscopic quantum systems with gravity

Prospects for breakthrough propulsion from physics

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