Abstract
The possibility of a continuous choice of the boost for each orbit is studied by making use of some mathematical theorems on fibre bundles and it is shown that this choice is possible only for massive particles.
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References
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Communicated by R. Haag
Also G.I.F.T. Spain
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Boya, L.J., Cariñena, J.F. & Santander, M. On the continuity of the boosts for each orbit. Commun.Math. Phys. 37, 331–334 (1974). https://doi.org/10.1007/BF01645946
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DOI: https://doi.org/10.1007/BF01645946