Coherent state path integral and nonlinear sigma model for a condensate composed of fermions with precise, discrete steps in the time development - Condensed Matter > Statistical MechanicsReportar como inadecuado




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Abstract: A coherent state path integral is considered for fermions with precise,discrete time separation. We derive in detail a nonlinear sigma model of a paircondensate concerning the precise, discrete time step order which is usuallyabbreviated by the appealing but in fact non-existent hermitian form of thefields. This problem is ubiquitous in quantum many-body physics and alreadyoccurs in the original Dyson equation. However, one has only to include a fewamendments concerning the precise, discrete time step development of coherentstate path integrals, compared to previous, abridged approaches, so that onecan accomplish the exact treatment of a spontaneous symmetry breaking with acoset decomposition for pair condensates and density parts.



Autor: Bernhard Mieck

Fuente: https://arxiv.org/







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