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We analyze the h-deformations of the Lorentz group and their associatedspacetimes. We prove that they have a twisted character and give explicitly thetwisting matrices. After studying the representations of one of the deformedspacetime algebras, we discuss the Klein-Gordon operator. It is found that theh-deformed d'Alembertian has plane wave solutions of the same form as thestandard ones. We also give explicit expressions for the h-gamma matricesdefining the associated Dirac equations.Comment: 22 pages, plain-LaTex fil

Twisted $h$ -spacetimes and invariant equations