Tachyons and Solitons in Spontaneous Symmetry Breaking in the Frame of Field Theory. - Yiannis Contoyiannis; Michael P. Hanias; Pericles Papadopoulos; Stavros G. Stavrinides; Myron Kampitakis; Stelios M. Potirakis; Georgios Balasis (Symmetry, 2021)