Ives–Stilwell experiment


Ives–Stilwell experiment

The Ives–Stilwell experiment exploits the Transverse Doppler effect (TDE) described by Albert Einstein in his 1905 paper.

Einstein subsequently suggested an experiment based on the measurement of the relative frequencies of light perceived as arriving from a light source in motion with respect to the observer. Herbert E. Ives and G. R. Stilwell undertook the task of executing the experiment and they came up with a very clever way of separating the much smaller TDE from the much bigger longitudinal Doppler effect. The experiment was executed in 1938 and it was reprised multiple times [http://www.mpi-hd.mpg.de/ato/rel/] , [http://www.mpi-hd.mpg.de/ato/rel/doppler-symposium.tgif.pdf] .

Ives wanted to do a positive test of time dilation, as followed from the "theory of Lorentz and Larmor" and as was first suggested "by Einstein and Ritz". This was the first direct, quantitative test of the time dilation factor.

The Ives–Stilwell experiment forms one of the fundamental tests of special relativity theory. Other such tests were the Michelson–Morley and Kennedy–Thorndike experiments as well as the Kauffman experiments.

Analysis

If we assume that the speed of light is fixed with respect to the observer (“Classical Theory”), then the forward and rearward Doppler-shifted frequencies seen on a moving object will be f'/f = c/(c±v), where v is recession velocity. Under special relativity, the two frequencies will also include an additional “Lorentz factorredshift component.

When we invert these relationships so that they relate to wavelengths rather than frequencies, “Classical Theory” predicts redshifted and blueshifted wavelength values of 1+v/c and 1-v/c, so if all three wavelengths (redshifted, blueshifted and original) are marked on a linear scale, according to Classical Theory the three marks should be perfectly evenly spaced.

|.....|.....|

But if the light is shifted by special relativity's predictions, the additional Lorentz offset means that the two outer marks will be offset in the same direction with respect to the central mark.

|....|......|

Ives and Stilwell found that there was a significant offset of the centre of gravity of the three marks, and therefore the Doppler relationship was not that of "Classical Theory".

This approach had two main advantages:

#didn't require us to commit to an exact value for the velocity involved (which might have been theory-dependent), and
#it didn't require an understanding or interpretation of angular aberration effects, as might have been required for the analysis of a "true" transverse test.

References

*cite journal |last=Einstein |first=Albert |authorlink= |coauthors= |year=1905 |month= |title= _de. Zur Elektrodynamik bewegter Körper |journal= _de. Annalen der Physik |volume=322 |issue=10 |pages=891–921 |doi=10.1002/andp.19053221004 |url= |accessdate= |quote= [http://www.fourmilab.ch/etexts/einstein/specrel/www/ English translation: ‘On the Electrodynamics of Moving Bodies’]
*cite journal |last=Ives |first=H. E. |authorlink= |coauthors=Stilwell, G. R. |year=1938 |month= |title=An experimental study of the rate of a moving atomic clock |journal=Journal of the Optical Society of America |volume=28 |issue=7 |pages=215 |bibcode=1938JOSA...28..215I |url= |accessdate= |quote=
*cite journal |last=Ives |first=H. E. |authorlink= |coauthors=Stilwell, G. R. |year=1941 |month= |title=An experimental study of the rate of a moving atomic clock. II |journal=Journal of the Optical Society of America |volume=31 |issue=5 |pages=369 |bibcode=1941JOSA...31..369I |url= |accessdate= |quote=
* [http://www.exphy.uni-duesseldorf.de/ResearchInst/FundPhys.html Modern Reenactments of Relativity Tests]

ee also

* Herbert E. Ives


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Ives-Stilwell-Experiment — Das Ives Stilwell Experiment war das erste Experiment, mit dem der transversale Dopplereffekt und somit die aus der speziellen Relativitätstheorie folgende Zeitdilatation direkt nachgewiesen werden konnte. Zusammen mit dem Michelson Morley… …   Deutsch Wikipedia

  • Stilwell — or Stillwell may refer to: People* Arthur Stilwell, Kansas City Southern Railway founder * Eric A. Stillwell, American television producer * Frank Stilwell, Old West outlaw * G. R. Stilwell, of the Ives–Stilwell experiment * Heather Stilwell,… …   Wikipedia

  • Ives — ist der Name bzw. Familienname folgender Personen: Ives, englischer Bischof († 1003), begraben in St Ives (Südostengland) St. Ives, einer kornischen Heiligen Burl Ives (1909 1995), US amerikanischer Folk Sänger, Autor und Schauspieler Charles… …   Deutsch Wikipedia

  • Ives — There are several people and things named Ives:* Burl Ives, American singer, author, and actor * Charles Ives, U. S. classical music composer * Clarrie Ives, Australian rugby league footballer * Clay Ives, Canadian born American luger * Currier… …   Wikipedia

  • Herbert E. Ives — Herbert Eugene Ives Herbert Eugene Ives (* 21. Juli 1882 in Philadelphia; † 13. November 1953) war ein US amerikanischer Physiker und Erfinder. Herbert E. Ives studierte an der University of Pennsylvania und an der Johns Hopkins University, wo er …   Deutsch Wikipedia

  • Kennedy-Thorndike-Experiment — Das Kennedy Thorndike Experiment sollte nachweisen, ob die Änderung der Geschwindigkeit des Beobachters in verschiedenen Inertialsystemen einen Einfluss auf die Ausbreitung des Lichtes hat. Damit sollte die Existenz der Zeitdilatation der… …   Deutsch Wikipedia

  • Herbert E. Ives — Infobox Engineer image size = 150px caption = PAGENAME name = PAGENAME nationality = birth date =July 21, 1882 birth place =Philadelphia, Pennsylvania death date = November 13, 1953 death place = education =University of Pennsylvania spouse =… …   Wikipedia

  • Michelson–Morley experiment — Box plots based on data from the Michelson–Morley experiment The Michelson–Morley experiment was performed in 1887 by Albert Michelson and Edward Morley at what is now Case Western Reserve University in Cleveland, Ohio. Its results are generally… …   Wikipedia

  • Michelson-Morley-Experiment — Wenn elektromagnetische Wellen an einen ruhenden Äther gebunden wären, müsste man die Eigenbewegung von Erde und Sonne als Ätherwind messen können. Das Michelson Morley Experiment war ein physikalisches Experiment, das von dem deutsch… …   Deutsch Wikipedia

  • Fizeau-Experiment — Aufbau des Fizeau Experiments aus dem Jahr 1851 Das Fizeau Experiment wurde von Hippolyte Fizeau 1851 durchgeführt, um die relativen Lichtgeschwindigkeiten im bewegten Wasser zu messen. Nach der Aussage Albert Einsteins war das Experiment… …   Deutsch Wikipedia