Yukawa model on a lattice in the quenched approximation.
The Yukawa model in the quenched approximation is expressed as a disordered statistical mechanics model on a four-dimensional Euclidean lattice. We study this model, giving particular attention to the singularities of the Dirac operator in the phase diagram. A careful analysis of a particular limiting case shows that finite volume effects can be huge and questions the quenched approximation. This is confirmed by numerical simulation performed in this limiting case and without the quenched approximation.
Departamento Sistemas Físicos, Químicos y Naturales, U. Pablo de Olavide, 41013 Sevilla, Spain. fcsotbor@upo.es
Feliciano
F
de Soto
Jean-Christian
JC
Anglès d'Auriac
D003198:Computer Simulation; D008956:Models, Chemical; D008958:Models, Molecular; D044367:Phase Transition