Resumen de Isometry groups of pseudoriemannian 2-step nilpotent lie groups

Luis Angel Cordero Rego, Phillip E. Parker

• While still a semidirect product, the isometry group can be strictly larger than the obvious Riemannian analogue I. In fact, there are three relevant groups of isometries, Ispl = I = I, and Ispl < I < I is possible when the center is degenerate. When the center is nondegenerate, Ispl = I.