# Hole-induced anomaly in the thermodynamic behavior of a one-dimensional Bose gas

@inproceedings{Rosi2021HoleinducedAI, title={Hole-induced anomaly in the thermodynamic behavior of a one-dimensional Bose gas}, author={Giulia De Rosi and Riccardo Rota and Grigori E. Astrakharchik and Jordi Boronat}, year={2021} }

We reveal an intriguing anomaly in the temperature dependence of the specific heat of a one-dimensional Bose gas. The observed peak holds for arbitrary interaction and remembers a superfluid-to-normal phase transition in higher dimensions, but phase transitions are not allowed in one dimension. The presence of the anomaly signals a region of unpopulated states which behaves as an energy gap and is located below the hole branch in the excitation spectrum. The anomaly temperature is found to be…

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