TL;DR
This paper uses the form factor bootstrap approach to classify all local fields in the sine-Gordon (SG) theory and compares the results with the free fermion case, revealing underlying structural insights.
Contribution
It provides a comprehensive description of local fields in SG theory and identifies the structural features responsible for counting them, advancing understanding of integrable quantum field theories.
Findings
Agreement with free fermion case confirmed
Structural features for counting local fields identified
Complete classification of local fields in SG theory achieved
Abstract
In terms of the form factor bootstrap we describe all the local fields in SG theory and check the agreement with the free fermion case. We discuss the interesting structure responsible for counting the local fields.
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