I have been reading around in general relativity, and see that, for Quantum Field Theory in Curved Spacetime, the notion of a preferred time coordinate comes up quite often (to distinguish positive frequencies). Why must the coordinate be 'preffered,' i.e. why must it be a consequence of the manifold's structure.(adsbygoogle = window.adsbygoogle || []).push({});

I understand this may sound like a stupid question, but any spacetime manifold admits at least one timelike (or two null coordinates) coordinate - why not simply use this?

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# Concerning the importance of preffered time coordinates

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