Wurden Tjamars Experimente schon verifiziert?

07/04/2008 - 08:41 von holzi | Report spam
Hallo,

nachdem vor einiger Zeit in einigen populàrwissenschaftlichen
Meldungen die Experimente (und va. deren Interpretation) etwas
Aufregung verursacht haben wurde es wieder still darum.

Wurden die Experimente nun schon verifiziert (oder verworfen)? Ich hab
mit google zumindest keine aktuellen Forschungsergebnisse dazu
gefunden.

lg
Harald
 

Lesen sie die antworten

#1 Joachim Pimiskern
07/04/2008 - 09:26 | Warnen spam
"holzi" schrieb:

Wurden die Experimente nun schon verifiziert
(oder verworfen)? Ich hab mit google zumindest
keine aktuellen Forschungsergebnisse dazu gefunden.



Der Versuch von Martin Tajmar wurde an der Canterbury
Ring Laser Group (Neuseeland) nachgestellt.

R.D. Graham, R.B. Hurst, R.J. Thirkettle, C.H. Rowe,
P.H. Butler

Experiment to Detect Frame Dragging in a
Lead Superconductor


Dort heißt es, und das klingt ein bissel negativ:

"Within the uncertainty of the experiment there is no indication
of any inertial frame dragging due to the rotation of the nearby
lead superconductor. The error of the experiment is [ca.] 3% of
the effect predicted [5, 6] from the theory of Tajmar and de Matos
for a gravitomagnetic field anagalous to the London dipole field.
We can thus place a lower limit on any frame dragging effect.
If the effect exists it is at least 21 times smaller than indicated
by the theory."

http://www2.phys.canterbury.ac.nz/~physrin/papers/SuperFrameDragging2007.pdf

Martin Tajmar hat dazu Stellung genommen:

M. Tajmar, F. Plesescu, B. Seifert, R. Schnitzer, and I. Vasiljevich
Search for Frame-Dragging-Like Signals Close to Spinning
Superconductors

"Recently, an independent experimental test was carried out, where a
lead disc at liquid helium temperature was spinning close to the
world's most precise ring laser gyro UG2 from the Canterbury Ring
Laser Group (Graham et al, 2007). Contrary to our setup, the gyro
here is operated outside of the cryostat facility due to its large
dimensions of 21x39.7 m. This should greatly reduce any vibration
offsets associated with the evaporating helium gas. Fig. 13a shows
the gyro's response to the speed of the spinning superconductor*.
Here too, we see that the gyro reacts if the superconductor is rotated.
Again, we note a parity violation as the gyro response is greater
for the counter-clockwise rotation - which is the opposite direction
as in our experiments. Since this experiment was carried out in the
southern hemisphere and our experiments in the northern hemisphere,
a first hint at the origin of the parity effect could be the Earth's
rotation. A similar parity anomaly that may be related to our effect
was reported on gyro weight and free-fall experiments in a Japanese
laboratory (Hayasaka and Takeuchi, 1989, Hayasaka et al, 1997), which
showed the same parity direction as in our laboratory and was also
located on the northern hemisphere. However, these claims could not
be verified in a number of replication attempts up to now (Luo et al,
2002 and references therein)."

Weiter schreibt er:
"Apart from the parity violation, this suggests that the effect
behaves similar to a classical frame-dragging field but greatly
amplified."

http://aps.arxiv.org/ftp/arxiv/pape...7.3806.pdf

Grüße,
Joachim

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