The functional integral in the Hubbard model
arXiv:1210.1022 · doi:10.1007/s11232-012-0115-5
Abstract
In a new functional integral approach proposed for the model, we find the regime with a deformed integration measure in which the standard integral is replaced with the Jackson integral. We indicate the relation to a p-adic functional integral. For the magnetic and electronic subsystems in the effective functional that results from the operator formulation of the Hubbard model, we find the two-parametric quantum derivative resulting in the appearance of the quantum SU_{rq}(2) group. We establish the relation to the one-parametric quantum derivative and the standard derivative.
18 pages
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