Physics – Quantum Physics
Scientific paper
2004-10-25
Int.J.Mod.Phys. A20 (2005) 3488-3494
Physics
Quantum Physics
talk presented at DPF2004 meeting in Riverside, CA; to appear in a supplement in International Journal of Modern Physics A
Scientific paper
10.1142/S0217751X05026819
We discuss a novel form of the variational approach in Quantum Field Theory in which the trial quantum configuration is represented directly in terms of relevant expectation values rather than, e.g., increasingly complicated structure from Fock space. The quantum algebra imposes constraints on such expectation values so that the variational problem is formulated here as an optimization under constraints. As an example of application of such approach we consider the study of ground state and critical properties in a variant of nonlinear sigma model.
Ji Chueng-Ryong
Mishchenko Yuriy
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