Phase transition dynamics in relativistic quantum systems

• Grant number: 05/03450-0
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: April 01, 2006
• End date: March 31, 2010
• Field of knowledge: Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields
• Principal Investigator: Gastão Inácio Krein
• Grantee: Nadiane Cristina Cassol Seewald
• Host Institution: Instituto de Física Teórica (IFT). Universidade Estadual Paulista (UNESP). Campus de São Paulo. São Paulo , SP, Brazil

Abstract

The general objective of the project is to undertake studies on dynamical phase transitions in macroscopic systems whose microscopic dynamics is described by a relativistic quantum field theory, with particular emphasis on the phenomena of phase ordering and phase separation. The problem consists in obtaining the time evolution of order parameters through equations of motion derived from quantum n-particle (nPI) irreducible effective actions of the underlying quantum field theory. These equations can be put into the form of Langevin equations with additive andmultiplicative noises, where the order parameters can be conserved or not in time. The project will concentrate in the derivation of the equations of motion from 2-particle irreducible (2PI) quantum effective actions. For the derivation of the effective action an approximation scheme based on the method of the thermodynamically equivalent Hamiltonian will be developed, a method that has been useful in the studies of condensation phenomena and phase transitions in thermal equilibrium.

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

SEEWALD, Nadiane Cristina Cassol. Método do hamiltoniano termodinamicamente equivalente para sistemas de muitos corpos. 2012. Doctoral Thesis - Universidade Estadual Paulista (Unesp). Instituto de Física Teórica (IFT). São Paulo São Paulo.