Multiparticle Form Factors of the Principal Chiral Model At Large N

TL;DR

This paper computes explicit two- and four-particle form factors of Noether currents in the 1+1 dimensional principal chiral model with large N, using integrable bootstrap and large-N expansion techniques.

Contribution

It provides the first explicit calculations of multi-particle form factors in the principal chiral model at large N, combining bootstrap and large-N methods.

Findings

Explicit two-particle form factors derived

Explicit four-particle form factors derived

Method demonstrates effectiveness of combined bootstrap and large-N approach

Abstract

We study the sigma model with $SU(N)\times SU(N)$ symmetry in 1+1 dimensions. The two- and four-particle form factors of the Noether current operators are found, by combining the integrable-bootstrap method with the large-$N$ expansion.