'very roughly speaking, when most people think about an immaterial soul that persists after death, they have in mind some sort of blob of spirit energy that takes up residence near our brain, and drives around our body like a soccer mom driving an suv. the questions are these: what form does that spirit energy take, and how does it interact with our ordinary atoms? not only is new physics required, but dramatically new physics. within qft, there can't be a new collection of "spirit particles" and "spirit forces" that interact with our regular atoms, because we would have detected them in existing experiments. ockham's razor is not on your side here, since you have to posit a completely new realm of reality obeying very different rules than the ones we know.'
the entire piece here and at cosmic variance.
