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I met some annoying problems on quantum field operators in QFT.They are as follows:

(1)The quantum field operator( scalar field operator, for example),is often noted as

φ（r,t). Can it be interpreted as like this: φ（r,t) is the coordinate represetation of a

more abstract,theoretical operator φ in Hilbert space?

(2)Is there exist the represetation(such as momentum, coordinate.....) which is similar to

that in quantum mechanics in QFT?

Thanks for reply!!!

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# Problems on quantum field operators in QFT

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