# On particle creation by black holes

@article{Wald1975OnPC, title={On particle creation by black holes}, author={Robert M. Wald}, journal={Communications in Mathematical Physics}, year={1975}, volume={45}, pages={9-34} }

Hawking's analysis of particle creation by black holes is extended by explicitly obtaining the expression for the quantum mechanical state vector ψ which results from particle creation starting from the vacuum during gravitational collapse. (Hawking calculated only the expected number of particles in each mode for this state.) We first discuss the quantum field theory of a Hermitian scalar field in an external potential or in a curved but asymptotically flat spacetime with no horizon present…

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