Abstract
Two criteria to find the good vacuum in a curved space-time are studied. In a generic Robertson-Walker universe they are not coincident; yielding to the well-known ambiguity in the vacuum definition. In few cases they coincide and give well-established vacua. An approximate vacuum is introduced in intermediate situations.
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Castagnino, M. On curved space vacua deduced from the energy-momentum tensor. Gen Relat Gravit 15, 1149–1162 (1983). https://doi.org/10.1007/BF00761581
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DOI: https://doi.org/10.1007/BF00761581