| タイトル | Lorentz Invariance Violation and the Observed Spectrum of Ultrahigh Energy Cosmic Rays |
| 本文（外部サイト） | http://hdl.handle.net/2060/20090012456 |
| 著者（英） | Stecker, F. W.; Scully, S. T. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2009-01-01 |
| 言語 | eng |
| 内容記述 | There has been much interest in possible violations of Lorentz invariance, particularly motivated by quantum gravity theories. It has been suggested that a small amount of Lorentz invariance violation (LIV) could turn of photomeson interactions of ultrahigh energy cosmic rays (UHECRs) with photons of the cosmic background radiation and thereby eliminate the resulting sharp steepening in the spectrum of the highest energy CRs predicted by Greisen Zatsepin and Kuzmin (GZK). Recent measurements of the UHECR spectrum reported by the HiRes and Auger collaborations, however, indicate the presence of the GZK effect. We present the results of a detailed calculation of the modification of the UHECR spectrum caused by LIV using the formalism of Coleman and Glashow. We then compare these results with the experimental UHECR data from Auger and HiRes. Based on these data, we find a best fit amount of LIV of 4.5+1:5 ..4:5 x 10(exp -23),consistent with an upper limit of 6 x 10(exp -23). This possible amount of LIV can lead to a recovery of the cosmic ray spectrum at higher energies than presently observed. Such an LIV recovery effect can be tested observationally using future detectors. |
| NASA分類 | Astrophysics |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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