Abstract
The adiabatic particle definition of Parker [1] has only been discussed for particular choices of the field variable and time coordinate, referred to here as the choice of a normal-form. It seems to have been implicitly assumed that the associated vacuum is independent of the normal-form chosen; we show that this is indeed the case.
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References
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NATO Postdoctoral Fellow.
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Dray, T., Renn, J. The normal-form (In)dependence of the adiabatic particle definitions. Gen Relat Gravit 16, 325–332 (1984). https://doi.org/10.1007/BF00762190
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DOI: https://doi.org/10.1007/BF00762190