Are classical tachyons slower-than-lightquantum particles?

Summary

After having studied the shape that a tachyon T(e.g., intrinsically spherical) would take up, we show in an explicit example that the characteristics ofclassical tachyons are similar to those of the ordinary (slower-than-light)quantum particles. In particular, a realistic tachyon is associated with a « phase speed »V [V² > c²], but with a « group speed »v = c²/V v² < c²].