kilobug comments on Harry Potter and the Methods of Rationality discussion thread, part 21, chapters 91 & 92 - Less Wrong Discussion
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Or the Killing Curse destroys the soul (as does the Dementor's Kiss), whereas bleeding to death merely releases it from the body.
A test: Are there any ghosts of people killed by Avada Kedavra? Ghosts are noted as being only echoes of the dead person — but if they are echoes formed by the release of an intact soul, then there would not be one for anyone killed in a way that consumes the soul, such as Avada Kedavra or the Dementor's Kiss.
(I can't think of any in canon. The four House Ghosts were all killed by mundane means, and Moaning Myrtle by a basilisk's stare.)
Do the temporary ghosts of resurrection stone and "priori incantatem" count for you ?
That could only work if "permanent" ghosts are really made from souls (Dumbledore hypothesis), but the temporary ghosts are made from memories (HJPEV hypothesis). While it's not impossible to have both mechanism, Occam's razor gives it a low prior, I would more suspect the same mechanism behind both.