The exact quantum sine-Gordon field equation and other non-perturbative results

@article{Babujian1999TheEQ,
  title={The exact quantum sine-Gordon field equation and other non-perturbative results},
  author={Hrachya M. Babujian and Michael Karowski},
  journal={Physics Letters B},
  year={1999},
  volume={471},
  pages={53-57}
}

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TLDR
The universal singular free energy per correlation volume fs2 is equal to -(c12)(2-)(1-)-1, where c is the central charge of the theory at criticality, is the usual specific-heat exponent, and is defined (for >0) in terms of the second moment of the energy correlations.
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