Plane torsion waves in the Poincaré gauge gravitation theory (Q1943783)

The authors generalize the concept of a gravitational wave in such a way that the torsion tensor may be different from zero. The crucial condition is that the isometries of the underlying metrical tensor have to be compatible with the torsion tensor. Under these conditions they find out, which types of massless plane torsion waves are possible within the Poincaŕe gauge gravitation theory. The present paper is a continuation of [\textit{O. V. Babourova}, Classical Quantum Gravity 16, No. 4, 1149--1162 (1999; Zbl 0937.83035)].