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Title: Resurgence and dynamics of O(N) and Grassmannian sigma models

Journal Article · · Journal of High Energy Physics (Online)
 [1];  [2]
  1. Univ. of Connecticut, Storrs, CT (United States)
  2. North Carolina State Univ., Raleigh, NC (United States)

Here, we study the non-perturbative dynamics of the two dimensional O(N) and Grassmannian sigma models by using compactification with twisted boundary conditions on R×S1, semi-classical techniques and resurgence. While the O(N) model has no instantons for N > 3, it has (non-instanton) saddles on R2, which we call 2d-saddles. On R×S1, the resurgent relation between perturbation theory and non-perturbative physics is encoded in new saddles, which are associated with the affine root system of the o(N) algebra. These events may be viewed as fractionalizations of the 2d-saddles. The first beta function coefficient, given by the dual Coxeter number, can then be intepreted as the sum of the multiplicities (dual Kac labels) of these fractionalized objects. Surprisingly, the new saddles in O(N) models in compactified space are in one-to-one correspondence with monopole-instanton saddles in SO(N) gauge theory on R3×S1. The Grassmannian sigma models Gr(N, M) have 2d instantons, which fractionalize into N kink-instantons. The small circle dynamics of both sigma models can be described as a dilute gas of the one-events and two-events, bions. One-events are the leading source of a variety of non-perturbative effects, and produce the strong scale of the 2d theory in the compactified theory. We show that in both types of sigma models the neutral bion emulates the role of IR-renormalons. We also study the topological theta angle dependence in both the O(3) model and Gr(N, M), and describe the multi-branched structure of the observables in terms of the theta-angle dependence of the saddle amplitudes, providing a microscopic argument for Haldane’s conjecture.

Research Organization:
Univ. of Connecticut, Storrs, CT (United States); North Carolina State University, Raleigh, NC (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0010339; SC0013036
OSTI ID:
1441165
Journal Information:
Journal of High Energy Physics (Online), Vol. 2015, Issue 9; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 45 works
Citation information provided by
Web of Science

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Cited By (6)

Resurgence for superconductors journal December 2019
Universal renormalons in principal chiral models journal February 2020
Universal renormalons in principal chiral models text January 2020
Exponential reduction of finite volume effects with twisted boundary conditions text January 2016
Quantum Distillation of Hilbert Spaces, Semi-classics and Anomaly Matching text January 2018
Universal Renormalons in Principal Chiral Models text January 2019

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