Exact expectation values of local fields in the quantum sine-Gordon model
Sergei L. LukyanovL.D. Landau Institute for Theoretical Physics, Chernogolovka, 142432, RussiaAlexander B. ZamolodchikovDepartment of Physics and Astronomy, Rutgers University, Piscataway, NJ 08855-0849, USA
1997en
ABI
Abstract
We propose an explicit expression for vacuum expectation values 〈eiaϕ〉 of the exponential fields in the sine-Gordon model. Our expression agrees both with semi-classical results in the sine-Gordon theory and with perturbative calculations in the massive Thirring model. We use this expression to make new predictions about the large-distance asymptotic form of the two-point correlation function in the XXZ spin chain.
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Cited by 20 references