We give an overview on the problem of finding isometry as Lorentz transformation between given vectors of 4-velocity and its solutions. These Lorentz transformations are usually referenced as Lorentz links. We show that the links by boost, obtained independently by different authors in different forms, are identical. Finally, we discuss briefly some implications of the non-uniqueness of boost l...

In this work we report new results concerning the question of dynamical mass generation in the Lorentz and PCT violating quantum electrodynamics. A one loop calculation for the vacuum polarization tensor is presented. The electron propagator, “dressed” by a Lorentz breaking extra term in the fermion Lagrangian density, is approximated by its first order: this scheme is shown to break gauge inva...

Abstract Recently there are more and interest on the gravitational wave of moving sources. This introduces a Lorentz transformation problem wave. Although Bondi-Metzner-Sachs (BMS) theory has in principle already included wave, three dimensional tensor not been explicitly calculated before. Within four spacetime, have property `boost weight zero' `spin 2'. fact makes difficult to understand. In...