The Bethe-Salpeter amplitudes of the bound states formed by two scalar particles with unequal masses are analyzed in the massive scalar particle exchange ladder model. The norms of the amplitudes are calculated numerically, and it is confirmed that the norm vanishes for the bound state corresponding to the complex eigenvalue of the coupling constant. The behaviour of the Bethe-Salpeter amplitud...

Income and class biases in political representation have attracted a great deal of scholarly attention recent years. The reasons are understandable: since the 1980s, very few democratically elected governments Organisation for Economic Cooperation Development (OECD) undertook new initiatives to compensate low- middle-income citizens unequal rise top-income shares concentration wealth. Instead, ...

The space-domain integral equation method using the generalized scattering matrix description of microwave passive circuits is employed to investigate the mode conversion of a CBCPW open-end discontinuity with unequal side plane widths. The conversion into two additional dominant modes, the c-modelike mode and the -mode-like mode, and into the transmitted microstrip mode from an incident CPW mo...

We describe the quantum phase transition of a Fermi gas occurring when the quasiparticle excitation energy has a minimum in momentum space which crosses zero on a sphere of radius k(0) not equal 0. The quasiparticles have a universal interaction which controls the physical properties in the vicinity of the quantum-critical point. We discuss possible applications to fermionic superfluids formed ...