We reinvestigate the emission of Hawking radiation during gravitational
collapse to a black hole. Studying the dynamics of invacuum
polarization, we find that a multiparametric family of outvacua
exists. Initial conditions for the collapse lead dynamically to
different vacua from this family as the final state. Therefore, the form
of the outvacuum encodes memory about the initial quantum state of the
system. While most outvacua feature a nonthermal 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.
