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Low-temperature thermal corrections to a superfluid's equation of state

Ioanna KourkoulouAlberto NicolisKlaas Parmentier
Dec 2022
摘要
Using effective field theory methods, we calculate the low-temperature phononthermal partition function for a generic superfluid, thus providing the leadingthermal corrections to a superfluid's equation of state, thermodynamicquantities, and conserved currents. We confirm the correctness of the classictwo-fluid model by matching to the effective field theory for that model. Wherethere is an overlap, our results agree with those of Carter and Langlois, whichwere derived by different methods. We also discuss generalizations and specialcases, including the non-relativistic limit and the conformal superfluid.
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