Poster presented by Michele Pepe

Poster Session

Topic: Spin Models

Four Loop results for the 2D O(n) nonlinear sigma model with 0-loop and 1-loop Symanzik actions

Abstract: We present a progress report of the perturbative calculation of the renormalization group invariant functions up to 4 loops for the O(n) nonlinear sigma-model in 2 dimensions on the lattice with the 0-loop and 1-loop Symanzik improved actions.

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