"the procedure of Wick rotation based on imaginary time, which is commonly used in this context (see e.g. [20]) does not work on a curved spacetime: " https://arxiv.org/abs/1605.03231 "a prescription for the Wick rotation of the fermionic part, " ..."Wick rotation is usually performed by rotating the zeroth (time) time coordinate to imaginary values: t → i t. (2.1) This is well described in the context of noncommutative geometry" (citing a paper on Connes) ..."unacceptable imaginary kinetic terms can appear. "
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