C. Novotny

Publications (23)5.33 Total impact

• Source

  Available from: Thomas Kuehl

  Article: Experimental test of special relativity by laser spectroscopy

  C. Novotny, B. Bernhardt, G. Ewald, C. Geppert, G. Gwinner, T. W. Hänsch, R. Holzwarth, G. Huber, S. Karpuk, H.-J. Kluge, T. Kühl, W. Nörtershäuser, S. Reinhardt, G. Saathoff, D. Schwalm, T. Udem, A. Wolf
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  ABSTRACT: The Doppler-free laser-spectroscopic frequency measurement of Doppler-shifted optical lines in forward and backward direction of a fast ion beam permits a sensitive test of the relativistic Doppler-formula and, hence, the relativistic time dilation factor gSR = ( 1 - n2 \mathord/ \vphantom n2 c2 c2 ) - 1 \mathord/ \vphantom - 1 2 2 \gamma _{{SR}} = {\left( {1 - {\nu ^{2} } \mathord{\left/ {\vphantom {{\nu ^{2} } {c^{2} }}} \right. } {c^{2} }} \right)}^{{{ - 1} \mathord{\left/ {\vphantom {{ - 1} 2}} \right. } 2}} . An experiment on metastable 7Li+, stored at a velocity of v = 0.064c in the Heidelberg heavy-ion storage ring TSR, has confirmed time dilation with unprecedented accuracy. Latest tests at two different ion-velocities (v = 0.03c and v = 0.064c) will enhance these measurements. An improved version of this experiment will be carried out at the experimental storage ring (ESR) at the Gesellschaft für Schwerionenforschung (GSI) in Darmstadt. The ESR permits 7Li+ to be stored at v = 0.33c which promises an improvement of the sensitivity to deviations from γ SR by an order of magnitude. A first test at the ESR has shown the feasibility for this kind of experiment.
  Hyperfine Interactions 04/2012; 171(1):57-67. · 0.21 Impact Factor
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  Available from: Thomas Kuehl

  Article: Comment on: “Lorentz violation in high-energy ions” by Santosh Devasia

  G. Saathoff, S. Reinhardt, R. Holzwarth, T. W. Hänsch, Th. Udem, D. Bing, D. Schwalm, A. Wolf, S. Karpuk, G. Huber, C. Novotny, B. Botermann, C. Geppert, W. Nörtershäuser, T. Kühl, T. Stöhlker, G. Gwinner
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  ABSTRACT: In an article “Lorentz violation in high-energy ions” by S. Devasia published in this Journal [EPJ C 69, 343 (2010)], our recent Doppler shift experiments on fast ion beams are reanalyzed. Contrary to our analysis, Devasia concludes that our results provide an “indication of Lorentz violation”. We argue that this conclusion is based on a fundamental misunderstanding of our experimental scheme and reiterate that our results are in excellent agreement with Special Relativity.
  European Physical Journal C 04/2012; 71(3):1-2. · 3.63 Impact Factor
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  Available from: Thomas Kuehl

  Article: Comment on "Missing Transverse-Doppler Effect in Time-Dilation Experiments with High-Speed Ions"

  G. Saathoff, S. Reinhardt, R. Holzwarth, T W Hänsch, Th. Udem, D. Bing, D. Schwalm, A Wolf, S. Karpuk, G Huber, C. Novotny, B. Botermann, C. Geppert, W. Nörtershäuser, T Kühl, T. Stöhlker, G. Gwinner
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  ABSTRACT: In an article "Missing Transverse-Doppler Effect in Time-Dilation Experiments with High-Speed Ions" by S. Devasia [arXiv:1003.2970v1], our recent Doppler shift experiments on fast ion beams are reanalyzed. Contrary to our analysis, Devasia concludes that our results provide an "indication of Lorentz violation". We argue that this conclusion is based on a fundamental misunderstanding of our experimental scheme and reiterate that our results are in excellent agreement with Special Relativity.
  02/2011;
• Chapter: Experimental Test of Time Dilation by Laser Spectroscopy on Fast Ion Beams

  G. Saathoff, G. Huber, S. Karpuk, C. Novotny, S. Reinhardt, D. Schwalm, A. Wolf, G. Gwinner
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  ABSTRACT: The Ives-Stilwell experiment – measuring the time dilation relation γSR = (1 – β 2)–½ – is one of the three classic experiments to test Special Relativity. Together with the interferometric tests of the velocity-independence as well as the isotropy of the speed of light, governed by the Michelson-Morley and the Kennedy-Thorndike experiment, respectively, the Ives-Stilwell experiment entirely establishes Special Relativity on an experimental basis and replaces Einsteins postulates [1]. While the interferometric experiments are ‘nullexperiments’ looking for deviations of the constancy of the speed of light, the time dilation test provides a positive measurement based on a Lorentz boost. It was Einstein who proposed already in 1907 to look for the time dilation effect by observing the Doppler-shifted wavelength of light emitted by excited fast atoms perpendicularly to the motion. In this direction, the classical Doppler effect vanishes leaving pure time dilation. However, it turned out that this scheme is difficult to implement as already small deviations of the observation angle from 90 degree would cause frequency shifts due to the classical Doppler effect which varies linearly around π/2. It took another 31 years until Ives and Stilwell performed the first measurement. Contrary to Einsteins idea they observed the Doppler shifts not perpendicularly but in forward and in backward direction of the atomic motion. This scheme provides different advantages. First, the classical Doppler shift vanishes in this scheme because it is of equal magnitude but opposite in sign in both directions of observation. Secondly, the measurement is less sensitive to small misalignments as the classical Doppler shift varies only quadratically around 0 and π. And finally, as two frequencies are measured, both the time dilation factor as well as the atoms’ velocity can be extracted to an accuracy given by the frequency uncertainty. When observing perpendicularly, the velocity has to be determined separately to provide a test of the time dilation relation. In the next section the principle of the Ives-Stilwell experiment
  11/2006: pages 479-492;
• Chapter: LASER SPECTROSCOPY ON RELATIVISTIC ION BEAMS

  S. Reinhardt, G. Saathoff, T. W. Hansch, C. Novotny, G. Huber, S. Karpuk, W. Nortershauser, D. Bing, D. Schwalm, A. Wolf, B. Botermann, C. Geppert, T. Kuhl, T. Stohlker
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  ABSTRACT: Times Cited: 0
  pages 297-303; , ISBN: 978-981-4282-33-8
• Article: Sub-Doppler laser spectroscopy on relativistic beams and tests of Lorentz invariance

  C. Novotny, G. Huber, S. Karpuk, S. Reinhardt, D. Bing, D. Schwalm, A. Wolf, B. Bernhardt, T. W. Hansch, R. Holzwarth, G. Saathoff, T. Udem, W. Nortershauser, G. Ewald, C. Geppert, T. Kuhl, T. Stohlker, G. Gwinner
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  ABSTRACT: Times Cited: 5
  80.
• Article: Experimental test of special relativity by laser spectroscopy

  C. Novotny, B. Bernhardt, G. Ewald, C. Geppert, G. Gwinner, T. W. Hansch, R. Holzwarth, G. Huber, S. Karpuk, H. J. Kluge, T. Kuhl, W. Nortershauser, S. Reinhardt, G. Saathoff, D. Schwalm, T. Udem, A. Wolf
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  ABSTRACT: Novotny, C. Bernhardt, B. Ewald, G. Geppert, C. Gwinner, G. Haensch, T. W. Holzwarth, R. Huber, G. Karpuk, S. Kluge, H. -J. Kuehl, T. Noertershaeuser, W. Reinhardt, S. Saathoff, G. Schwalm, D. Udem, T. Wolf, A.
  171:57-67.
• Article: Towards a precision test of time dilation at high velocity

  C. Novotny, B. Bernhardt, D. Bing, G. Ewald, C. Geppert, G. Gwinner, G. Huber, S. Karpuk, H. J. Kluge, T. Kuhl, W. Nortershauser, S. Reinhardt, G. Saathoff, D. Schwalm, T. Stohlker, A. Wolf
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  ABSTRACT: Times Cited: 1
  87:749-756.
• Article: Comment on: Lorentz violation in high-energy ions by Santosh Devasia

  G. Saathoff, S. Reinhardt, R. Holzwarth, T. W. Hansch, T. Udem, D. Bing, D. Schwalm, A. Wolf, S. Karpuk, G. Huber, C. Novotny, B. Botermann, C. Geppert, W. Nortershauser, T. Kuhl, T. Stohlker, G. Gwinner
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  ABSTRACT: Saathoff, G. Reinhardt, S. Holzwarth, R. Haensch, T. W. Udem, Th Bing, D. Schwalm, D. Wolf, A. Karpuk, S. Huber, G. Novotny, C. Botermann, B. Geppert, C. Noertershaeuser, W. Kuehl, T. Stoehlker, T. Gwinner, G.
  71.
• Source

  Available from: Thomas Kuehl

  Chapter: The dynamics of bunched laser-cooled ion beams at relativistic energies

  M. Bussmann, U. Schramm, D. Habs, M. Steck, T. Kuhl, K. Beckert, P. Beller, B. Franzke, W. Noortershaaeuser, C. Geppert, C. Novotny, J. Kluge, F. Nolden, T. Stoohlker, C. Kozhuharov, S. Reinhardt, G. Saathoff, S. Karpuk
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  ABSTRACT: Bussmann, M. Schramm, U. Habs, D. Steck, M. Kuehl, T. Beckert, K. Beller, P. Franzke, B. Noertershaeuser, W. Geppert, C. Novotny, C. Kluge, J. Nolden, F. Stoehlker, T. Kozhuharov, C. Reinhardt, S. Saathoff, G. Karpuk, S.
  ISBN: 1742-6588
• Article: Iodine hyperfine structure and absolute frequency measurements at 565, 576, and 585nm

  S. Reinhardt, G. Saathoff, S. Karpuk, C. Novotny, G. Huber, M. Zimmermann, R. Holzwarth, T. Udem, T.W. Hänsch, G. Gwinner
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  ABSTRACT: The hyperfine structure splittings of the P(10)14-1, R(15)14-1, and R(99)15-1 transitions at 585 nm, P(62)17-1 at 576 nm, and P(80)21-1 at 565 nm in 127I2 are measured by heterodyne spectroscopy using two dye lasers. In addition, the absolute frequencies of the hyperfine components P(10)14-1 a15 and P(80)21-1 a10 are determined using a self-referenced frequency comb. These frequencies are used in an experiment testing relativistic time dilation by laser spectroscopy on a fast ion beam.
  Optics Communications.
• Article: Sub-Doppler laser spectroscopy on relativistic beams and tests of Lorentz invariance

  C. Novotny, G Huber, S. Karpuk, S. Reinhardt, Dennis Bing, Dirk Schwalm, Andreas Wolf, B. Bernhardt, T W Hänsch, R. Holzwarth, G. Saathoff, T. Udem, Wilfried Nörtershäuser, G. Ewald, C. Geppert, T Kühl, Thomas Stöhlker, G. Gwinner
  Physical Review A, v.80, 1-5 (2009).
• Article: Sub-Doppler laser spectroscopy on relativistic beams and tests of Lorentz invariance

  C. Novotny, G Huber, S. Karpuk, S. Reinhardt, D. Bing, D. Schwalm, A Wolf, Birgitta Bernhardt, Theodor W. Hänsch, Ronald Holzwarth, Guido Saathoff, Thomas Udem, W. Nörtershäuser, G. Ewald, C. Geppert, T Kühl, T. Stöhlker, G. Gwinner
  Physical Review A, v.80 (2009).
• Article: Towards a precision test of time dilation at high velocity

  C. Novotny, B. Bernhardt, D. Bing, G. Ewald, C. Geppert, G. Gwinner, G Huber, S. Karpuk, H J Kluge, T Kühl, W. Nörtershäuser, S. Reinhardt, G. Saathoff, D. Schwalm, T. Stöhlker, A Wolf
  Canadian Journal of Physics, v.87, 7, 749-756 (2009).
• Article: Laser Spectroscopy on Relativistic Ion Beams

  Sascha Reinhardt, Guido Saathoff, Theodor W. Hänsch, C. Novotny, G Huber, S. Karpuk, W. Nörtershäuser, D. Bing, D. Schwalm, A Wolf, B. Botermann, C. Geppert, T Kühl, T. Stöhlker
  H. Yoneda, K. Nakagawa, F. Shimizu: Proceedings of the XIX International Conference Laser Spectroscopy, World Scientific, 297-303 (2010).
• Article: Towards a precision test of time dilation at high velocity

  C. Novotny, B. Bernhardt, Dennis Bing, G. Ewald, C. Geppert, G. Gwinner, G Huber, S. Karpuk, Hans-Jürgen Kluge, T Kühl, Wilfried Nörtershäuser, S. Reinhardt, G. Saathoff, Dirk Schwalm, Thomas Stöhlker, Andreas Wolf
  Canadian Journal of Physics, v.87, 749-756 (2009).
• Article: Sub-Doppler laser spectroscopy on relativistic beams and tests of Lorentz invariance

  C. Novotny, G. Huber, S. Karpuk, S. Reinhardt, D. Bing, D. Schwalm, A. Wolf, B. Bernhardt, T. W. Hänsch, R. Holzwarth, G. Saathoff, Th. Udem, W. Nörtershäuser, G. Ewald, C. Geppert, T. Kühl, T. Stöhlker, G. Gwinner
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  ABSTRACT: We demonstrate sub-Doppler laser spectroscopy with a beam of 7Li+ ions stored at 33.8% of the speed of light in the experimental storage ring at GSI. Using two lasers, the one copropagating and the other counterpropagating, with respect to the ion beam, a fluorescence line is observed via optical-optical double-resonance spectroscopy on a Λ-type level configuration. A linewidth of ≈114 MHz is found, which is 12 times narrower than the Doppler broadening due to the momentum spread of the ion beam. Interpreted as a test of Lorentz invariance, we find |α̂2|<1.2×10−5, a 25× tighter limit on O((v/c)4) deviations from time dilation than any other experiment.
  Phys. Rev. A. 80(2).
• Article: Towards a precision test of time dilation at high velocity

  C Novotny, B Bernhardt, D Bing, G Ewald, C Geppert, G Gwinner, G Huber, S Karpuk, H J Kluge, T Kuhl, W Nortershauser, S Reinhardt, G Saathoff, D Schwalm, T Stohlker, A Wolf
  Canadian Journal of Physics. 87(7):749-756.
• Article: Preparatory measurements for a test of time dilation in the ESR

  B Botermann, C Novotny, D Bing, C Geppert, G Gwinner, T W Hansch, G Huber, S Karpuk, T Kuhl, W Nortershauser, S Reinhardt, G Saathoff, D Schwalm, T Stohlker, A Wolf
  Canadian Journal of Physics. 89(1):85-93.
• Article: Sub-Doppler laser spectroscopy on relativistic beams and tests of Lorentz invariance

  C Novotny, G Huber, S Karpuk, S Reinhardt, D Bing, D Schwalm, A Wolf, B Bernhardt, T W Hansch, R Holzwarth, G Saathoff, T Udem, W Nortershauser, G Ewald, C Geppert, T Kuhl, T Stohlker, G Gwinner
  Physical Review A. 80(2).