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A friend of mine had the following funny question:
Imagine I have a metric ansatz with two unknown functions. The Einstein equations give both real and complex solutions for the unknown functions.
Question: Is there a decent interpretation of these complex solutions in GR?
We know about this Newman-Janis formalism in which one uses a complex metric ansatz in order to obtain rotating black holes from stationary solutions, but this is a more general situation.
Any suggestions are appreciated :)
Imagine I have a metric ansatz with two unknown functions. The Einstein equations give both real and complex solutions for the unknown functions.
Question: Is there a decent interpretation of these complex solutions in GR?
We know about this Newman-Janis formalism in which one uses a complex metric ansatz in order to obtain rotating black holes from stationary solutions, but this is a more general situation.
Any suggestions are appreciated :)