Experimental bounds on parameters of spin-spin interaction in gauge theory of gravitation

The contribution of the pseudovector component of the torsion for the hyperfine splitting of the hydrogen atom is considered. The calculations are made in the framework of a Poincaré gauge theory of gravitation with the most general Lagrangian quadratic in the curvature and torsion and containing a term of Hilbert–Einstein type. Some estimates of the model are obtained.