2012

Resurgence and Trans-series in Quantum Field Theory: The CP(N-1) Model

Dunne, Gerald V., Unsal, Mithat

Understand

This work is a step towards a non-perturbative continuum definition of quantum field theory (QFT), beginning with asymptotically free two dimensional non-linear sigma-models, using recent ideas from mathematics and QFT.

  • The ideas from mathematics are resurgence theory, the trans-series framework, and Borel-Ecalle resummation.
  • The ideas from QFT use continuity on R^1 x S^1_L, i.e, the absence of any phase transition as N \to infinity, or rapid-crossovers for finite-N, and the small-L weak coupling limit to render the semi-classical sector well-defined and calculable.
  • We classify semi-classical configurations with actions 1/N (kink-instantons), 2/N (bions and bi-kinks), in units where the 2d instanton action is normalized to one.

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