Renormalization group and nonequilibrium action in stochastic field theory

• Autores: Zanella, J.; Calzetta, E.
• Año de publicación: 2002
• Idioma: inglés
• Tipo de recurso: artículo
• Fuente: Phys Rev E. 2002;66(3)
• Materia: Anisotropy; Cameras; Charge coupled devices; Electric conductivity; Electric field effects; Electric potential; Electrodes; Electrolysis; Isotropic instability; Optical stripes; Polymer spacers; Williams domain (WD); Nematic liquid crystals; article
• Institución: Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales

We investigate the renormalization group approach to nonequilibrium field theory. We show that it is possible to derive nontrivial renormalization group flow from iterative coarse graining of a closed-time-path action. This renormalization group is different from the usual in quantum field theory textbooks, in that it describes nontrivial noise and dissipation. We work out a specific example where the variation of the closed-time-path action leads to the so-called Kardar-Parisi-Zhang equation, and show that the renormalization group obtained by coarse graining this action, agrees with the dynamical renormalization group derived by directly coarse graining the equations of motion. © 2002 The American Physical Society.
Fil:Calzetta, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.