  Several recent arguments purport to show that there can be no relativistic,
quantum-mechanical theory of localizable particles and, thus, that relativity
and quantum mechanics can be reconciled only in the context of quantum field
theory. We point out some loopholes in the existing arguments, and we provide
two no-go theorems to close these loopholes. However, even with these loopholes
closed, it does not yet follow that relativity plus quantum mechanics
exclusively requires a field ontology, since relativistic quantum field theory
itself might permit an ontology of localizable particles supervenient on the
fundamental fields. Thus, we provide another no-go theorem to rule out this
possibility. Finally, we allay potential worries about this conclusion by
arguing that relativistic quantum field theory can nevertheless explain the
possibility of "particle detections," as well as the pragmatic utility of
"particle talk."
