We reinvestigate the emission of Hawking radiation during gravitational
collapse to a black hole. Studying the dynamics of in-vacuum
polarization, we find that a multi-parametric family of out-vacua
exists. Initial conditions for the collapse lead dynamically to
different vacua from this family as the final state. Therefore, the form
of the out-vacuum encodes memory about the initial quantum state of the
system. While most out-vacua feature a non-thermal Hawking flux and are
expected to decay quickly, there also exists a thermal vacuum state.
Collectively, these observations suggest an interesting possible
resolution of the information loss paradox.
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