Can quantum heat actually hold a wormhole open?

Traversable wormholes require 'exotic matter' that violates normal energy conditions — a job quantum fields might actually do. This calculation shows that a massive quantum scalar field at thermal equilibrium near a wormhole throat can satisfy those requirements, but only if the field's mass sits within a specific finite range and the temperature stays below a critical threshold that depends on that mass. Too hot or the wrong mass, and the wormhole collapses.