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I'm currently trying to learn some QFT and the reader gives an introduction by expressing the non-relativistic hamiltonian with integral and creation, destruction operators.

Later he writes:

|Psi, t > = \int d

^{3}x

_{1}...

^{3}x

_{n}Psi(x

_{1}, ..., x

_{n}; t) a

^{+}(x

_{1}) ... |0>

And i´m not really sure how to think about this. Isn't |Psi, t > the wavevector of Psi(x

_{1}, ..., x

_{n}; t) ?

Please give me some handwaving or mental words about why this is true..