Dynamical torsion in a gravitational theory coupled to first-order twist-tensor matter fields

A gravity-matter theory is developed using twist tensors as bona fide matter fields which are minimally coupled to gravitation by means of a first-order matter Lagrangian. The main features of the theory are (i) torsion is generated dynamically by the matter fields and (ii) torsion is coupled to a scalar field via a nonzero spin density which arises from the first-order matter Lagrangian but nevertheless provides a vanishing integrated spin for the scalar field. The equations of motion for the fields are given and some solutions are discussed