title: Expectation values in the Lieb-Liniger Bose gas.
abstract: We present a novel method to compute expectation values in the Lieb-Liniger model both at zero and finite temperature. These quantities, relevant in the physics of one-dimensional ultracold Bose gases, are expressed by a series that has a remarkable behavior of convergence. Among other results, we show the computation of the three-body expectation value at finite temperature, a quantity that rules the recombination rate of the Bose gas.
authors.affiliation: SISSA and INFN, Sezione di Trieste, via Beirut 2/4, I-34151 Trieste, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Kormos
authors.forename: G
authors.initials: G
authors.lastname: Mussardo
authors.forename: A
authors.initials: A
authors.lastname: Trombettoni