Finite-temperature properties of low-dimensional bosons with three-body interaction

V. Polkanov; V. Pastukhov

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arXiv · 2604.04114

Finite-temperature properties of low-dimensional bosons with three-body interaction

V. Polkanov·V. Pastukhov

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Abstract

We discuss the finite-temperature properties of low-dimensional bosons with three-body interactions described by a Feshbach-resonance-like two-channel model. In particular, by using the approximate consideration that collects ring-like Feynman diagrams for the grand potential and resembles the three-body $t$-matrix approximation, we have computed the third virial coefficient, an equation of state, and the temperature depletion of the average number of closed-channel trimers. The calculated heat capacity demonstrates a non-monotonic temperature behavior, which is unusual for a low-dimensional Bose gas.

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V. Polkanov, V. Pastukhov. 2026-04-05. Finite-temperature properties of low-dimensional bosons with three-body interaction. https://arxiv.org/abs/2604.04114

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