  This article presents theoretical arguments that certain virtual bound states
carry the trace component of affine torsion. The motivation for this work is
that Einstein Cartan theory, which extends general relativity by including
torsion to model intrinsic angular momentum, is becoming more credible. The
author is not aware of any situation for which there is evidence or substantial
argument for the presence of torsion trace, except in the continuum theory of
edge dislocations in crystals. The main evidence for the hypothesis consists of
analogies between the structure of virtual bound states and (a) geometry of
dislocations in crystal lattices, which are modeled with torsion; and (b)
modeling of intrinsic angular momentum by torsion in Einstein Cartan theory and
the theory of microelasticity. The work focuses on conjectured presence of
torsion in para-positronium, which intermediates annihilation of an electron
and a positron with opposite z spins. If the virtual bound state carries
torsion, then the local law of conservation of angular momentum can hold over
the spacelike separation during annihilation.
