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Martin Tajmar is a research scientist and project manager in the Space Propulsion group at Austrian Research Center (ARC) Seibersdorf. He has research interests in new space propulsion systems, and possible connections between gravity and superconductivity.
Biography
He completed his PhD in Numerical Plasmaphysics at the Vienna University of Technology, Austria, in 1999, and is now an external lecturer for the University.
In 2003 he published the textbook Advanced Space Propulsion Systems (ISBN: 978-3-211-83862-4).
Gravitomagnetism research
In a 2003 paper, Tajmar proposed a gravitational effect may explain the long-standing discrepancy between the mass of Cooper pairs first measured in superconductors by Janet Tate et.al and the theoretically expected value.
In 2006, Martin Tajmar and several coworkers announced their claim to have measured a gravitomagnetic version of the Frame-dragging effect caused by a spinning superconductor . The effect was presented as being analogous to the electromagnetic London moment which is present in any spinning superconductor. The magnitude of the effect was claimed to be proportional to the ratio of the density of Cooper pairs in the superconducting ring to the mass density of the superconductor material. Under this model only low critical temperature superconductors such as lead and niobium would be expected to produce a gravitational effect.
With superconducting rings undergoing angular acceleration of the order of 1000 rad s they claim to have detected an acceleration on nearby accelerometers of the order of 0.002 m s when the superconductor was undergoing angular acceleration. While the effect is very small it is some 30 orders of magnitude larger than predicted by accepted general relativity theory. It should be noted that Tajmar and his colleagues emphasize that they do not detect any form of gravitational shielding effects above the rotating superconductors, in contrast to claims by Eugene Podkletnov for experiments with a similar apparatus.
Should the effect be confirmed independently it would have significant implications for gravitational and condensed matter physics and may have numerous technological applications. The effect has not yet been observed independently. In 2006 A New Zealand research group performed a similar experiment using a lead superconductor with an an ultra-large ring laser gyroscope as a rotation sensor. Unlike an accelerometer, a ring laser gyroscope would be expected to produce a signal proportional to the angular velocity of the superconductor. The New Zealand group conclude with 95% certainty that if the effect exists it is at least 22 times smaller than predicted by the original theory of Tajmar.
In July 2007 Tajmar was co-author on a paper presented at the 18th International Conference on General Relativity & Gravitation, Sydney . In this paper an alternative interpretation of the experimental data from the New Zealand group was presented. Under this interpretation the experiment was considered to confirm the effect though only for rotation in the anti-clockwise direction. In the same paper, additional laser gyroscope results from the Austrian laboratory have been presented which show an effect only in the clockwise direction. Tajmar suggested the possibility of a non-parity effect as the respective laboratories are in different hemispheres. Results were also presented from sensors at different distances from the superconductor which indicate a non-dipole field distribution. In this paper the authors also referred to several possible theoretical explanations for the effect, including one by De Matos et al. involving Dark Energy and one by Walter Dröscher et al. involving extended Heim Theory.
See also
- Coupling of Electromagnetism and Gravitation in the Weak Field Approximation .
- arXiv:gr-qc/0003011v1
- Towards a new test of general relativity?, (Tajmar gravimagnetic field experiment) European Space Agency News, 2006-03-23
- Measurement of Gravitomagnetic and Acceleration Fields Around Rotating Superconductors Tajmar, M.; Plesescu, F.; Seifert, B.; and Marhold, K. (2006). "Measurement of Gravitomagnetic and Acceleration Fields Around Rotating Superconductors". arXiv:gr-qc/0610015.
{{cite arXiv}}: Unknown parameter|version=ignored (help)CS1 maint: multiple names: authors list (link) - Gravity's secret, New Scientist, 2006-11-11
- Component descriptions and schematics are provided in the following two volumes:
- http://stinet.dtic.mil/cgi-bin/GetTRDoc?AD=A461571&Location=U2&doc=GetTRDoc.pdf
- http://stinet.dtic.mil/cgi-bin/GetTRDoc?AD=A461570&Location=U2&doc=GetTRDoc.pdf
References
- Home page and biography at the Technical University of Vienna.
- Tajmar, M.; de Matos, C.J. (2003), "Coupling of Electromagnetism and Gravitation in the Weak Field Approximation", Physica C, 385 (1): 551--554
{{citation}}: More than one of|number=and|issue=specified (help) - Tajmar, M.; Plesescu, F.; Marhold, K.; and de Matos, C.J. (2006). "Experimental Detection of the Gravitomagnetic London Moment". arXiv:gr-qc/0603033.
{{cite arXiv}}: Unknown parameter|version=ignored (help)CS1 maint: multiple names: authors list (link) - Tajmar, M.; Plesescu, F.; Marhold, K.; and de Matos, C.J. (2006). "Experimental Detection of the Gravitomagnetic London Moment". arXiv:gr-qc/0603033.
{{cite arXiv}}: Unknown parameter|version=ignored (help)CS1 maint: multiple names: authors list (link) - Graham, R.D.; Hurst, R.B.; Thirkettle, R.J.; Rowe, C.H.; Butler, P.H. (2007), Experiment to Detect Frame Dragging in a Lead Superconductor (PDF), retrieved 19 Oct 2007
{{citation}}: Unknown parameter|month=ignored (help) (Submitted to Physica C) - Tajmar, M.; Plesescu, F.; Seifert, B.; Schnitzer, R.; and Vasiljevich, I. (2007). "Search for Frame-Dragging in the Vicinity of Spinning Superconductors". arXiv:arXiv:0707.3806.
{{cite arXiv}}: Check|arxiv=value (help); Unknown parameter|version=ignored (help)CS1 maint: multiple names: authors list (link) - Tajmar, M.; de Matos, C.J. (2001). "Coupling of Electromagnetism and Gravitation in the Weak Field Approximation" (PDF). Journal of Theoretics. 3 (1).