20.500.12556/RUL-104060 Correlation functions of the quantum sine-Gordon model in and out of equilibrium Complete information on the equilibrium behavior and dynamics of quantum field theory (QFT) is provided by multipoint correlation functions. However, their theoretical calculation is a challenging problem, even for exactly solvable models. This has recently become an experimentally relevant problem, due to progress in cold-atom experiments simulating QFT models and directly measuring higher order correlations. Here we compute correlation functions of the quantum sine-Gordon model, a prototype integrable model of central interest from both theoretical and experimental points of view. Building upon the so-called truncated conformal space approach, we numerically construct higher order correlations in a system of finite size in various physical states of experimental relevance, both in and out of equilibrium. We measure deviations from Gaussianity due to the presence of interaction and analyze their dependence on temperature, explaining the experimentally observed crossover between Gaussian and non-Gaussian regimes. We find that correlations of excited states are markedly different from the thermal case, which can be explained by the integrability of the system. We also study dynamics after a quench, observing the effects of the interaction on the time evolution of correlation functions, their spatial dependence, and their non-Gaussianity as measured by the kurtosis. statistical mechanics quantum mechanics quantum field theory integrable models statistična mehanika kvantna mehanika kvantna teorija polja integrabilni modeli true false false Angleški jezik Slovenski jezik Neznano 2018-10-03 14:06:06 2018-10-03 14:06:06 2022-08-17 03:42:54 0000-00-00 00:00:00 2018 0 0 Str. 110402-1-110402-7 iss. 11 Vol. 121 2018 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 530.145 0031-9007 10.1103/PhysRevLett.121.110402 3251556 1282575 RAZ_Kukuljan_Ivan_i2018.pdf RAZ_Kukuljan_Ivan_i2018.pdf 1 0854894DADAEE6EAAE39F60ED9D8B6C4 8154a59ac98cd073e94256b0f6bc5dbe4021a2329a26f618d6936e1af94496cd f8c70134-a1b5-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=114574 https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.121.110402 1 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=140701 Fakulteta za matematiko in fiziko 0 0 0