Post-Newtonian effects in the quadratic Poincaré gauge theory of gravitation.

Abstract

The post-Newtonian approximation of the Poincar\'e gauge theory (PGT) of gravitation with an arbitrary Lagrangian is calculated. The constraints on the parameters of the PGT which follow from light deflection and retardation experiments and composition-independent fifth-force data are obtained. It is shown that modern experimental data cannot rule out the existence of massive torsion particles with both large and very small masses.