Abstract
It has been suggested that causality problems associated with tachyons can be eliminated by the existence of a perferred frame of rest in which backward time travel is impossible. Furthermore, cosmology provides a de facto preferred rest frame. However, it is demonstrated here that the observed expansion of the universe raises further problems for the existence of tachyons.
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Walstad, A. Tachyons in an expanding universe. Found Phys 9, 371–374 (1979). https://doi.org/10.1007/BF00708528
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DOI: https://doi.org/10.1007/BF00708528