@article{Pastukhov_2022, title={Dynamical Properties of a Bose Gas with δ-like Interaction between Particles at Temperatures above the Phase Transition Point and in the Limit of Strong Interparticle Repulsion}, volume={56}, url={https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2022076}, DOI={10.15407/ujpe56.6.554}, abstractNote={<p>Exact equations for the one-particle Green’s function and for the irreducible part of the two-particle Green’s function of a three-dimensional Bose gas with point-like interaction between particles have been derived in the framework of the functional integral approach. The two-particle spectrum of the system has been analyzed in detail in the simplest approximation, which makes allowance for all two-particle scattering processes. The leading asymptotics of the single-particle spectrum in the long-wave range was shown to remain quadratic. The critical temperature was found in the limit of strong repulsion between particles.</p>}, number={6}, journal={Ukrainian Journal of Physics}, author={Pastukhov В.С.}, year={2022}, month={Feb.}, pages={554} }