Tomaschitz, R. (2000). Conformal tachyons, International Journal of Modern Physics A 15, 3019-3035, DOI: 10.1142/S0217751X0000135X
Abstract (WorldSciNet, SAO/NASA ADS, Zbl 0966.83004)
We study tachyons conformally coupled to the background geometry of a Milne universe. The causality of superluminal signal transfer is scrutinized in this context. The cosmic time of the comoving frame determines a distinguished time order for events connected by superluminal signals. An observer can relate his rest frame to the galaxy frame, and compare so the time order of events in his proper time to the cosmic time order. All observers can in this way arrive at identical conclusions on the causality of events connected by superluminal signals. An unambiguous energy concept for tachyonic rays is defined by means of the cosmic time of the comoving reference frame, without resorting to an antiparticle interpretation. On that basis we give an explicit proof that no signals can be sent into the past of observers. Causality violating signals are energetically forbidden, as they would have negative energy in the rest frame of the emitting observer. If an observer emits a superluminal signal, the tachyonic response of a second observer cannot reach him prior to the emission, i.e. no predetermination can occur.
Zbl
0966.83004
Tomaschitz, Roman
Conformal tachyons.
[J] Int.
J. Mod. Phys. A 15, No.19, 3019-3035 (2000). ISSN 0217-751X
MSC 2000:
83C10 Equations of motion
Keywords: superluminal signal transfer
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Conformal Tachyons |
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Tomaschitz, Roman |
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AA(Department of Physics, Hiroshima University, 1-3-1 Kagami-yama, Higashi-Hiroshima 739-8526, Japan; roman@fusion.sci.hiroshima-u.ac.jp) |
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International Journal of Modern Physics A, Volume 15, Issue 19, pp. 3019-3035 (2000). (IJMPA Homepage) |
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00/2000 |
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description: Roman Tomaschitz (2000) Conformal tachyons, International Journal of Modern Physics A 15, 3019.
Keywords: Robertson–Walker cosmology, tachyons conformally coupled to the background metric, negative mass-square, causality of superluminal signal transfer, positivity of tachyonic energy, absolute space and cosmic time, comoving galaxy frame, globally geodesic rest frames in the Milne universe
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