Bazhanov, VladimirLukyanov, Sergei LZamolodchikov, Alexander B2015-12-130550-3213http://hdl.handle.net/1885/93513We prove that certain non-equilibrium expectation values in the boundary sine-Gordon model coincide with associated equilibrium-state expectation values in the systems which differ from the boundary sine-Gordon in that certain extra boundary degrees of freedom (q-oscillators) are added. Applications of this result to actual calculation of non-equilibrium characteristics of the boundary sine-Gordon model are also discussed.Keywords: Integrable quantum field theory; Non-equilibrium expectation values19992015-12-12