Antimatter and Pseudotachyonic Relativity

A new conception of antiparticle is proposed as the subluminal '' image '' of a tachyonic homologous particle. After a first article on the subject, we begin by studying the pseudotachyonic transformation for energy, linear momentum and mass. We'll finally conclude that: · antiparticles must have negative energy (and massive ones also negative masses) and opposite electric charge; · antiphotons behave differently from photons; · this difference appears, for instance, in the Compton effect generalized to antiparticles; · the annihilation of colliding homologous particles and pair creation through colliding particles (this one yet an open problem) doesn't exactly fit in its standard description; · antimatter is characterized by negative absolute temperatures and the inversion of the 2nd law of Thermodynamics. (author)