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In this paper, we present evidence for a liquid-like phase in systems of manyinteracting Bosons at intermediate densities. The interacting Bose gas has beenstudied extensively in the low and high density regimes, in which interactionsdo not play a physically significant role, and the system behaves similarly tothe ideal quantum gas. Instead, we will turn our attention to the intermediatedensity regime, and report evidence that the system enters a stronglycorrelated phase where its behavior is markedly different from that of theideal quantum gas. To do so, we use the Simplified approach to the Bose gas,which was introduced by Lieb in 1963 and recently found to provide veryaccurate predictions for many-Boson systems at all densities. Using this tool,we will compute predictions for the radial distribution function, structurefactor, condensate fraction and momentum distribution, and show that they areconsistent with liquid-type behavior.

Evidence of a liquid phase in interacting Bosons at intermediate densities