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The improved Gaussian approximation Calculation of Bogoliubov Mode in One Dimensional Bosonic Gas

In this paper, we study the homogeneous one-dimensional bosonic gas interacting via a repulsive contact potential by using the improved Gaussian approximation. We obtain the gapless excitation spectrum of Bogoliubov mode. Our result is in good agreement with the exact numerical calculation based on the Bethe ansatz. We speculate that the improved Gaussian approximation could be a quantitatively good approximation for higher dimensional systems.

preprint2012arXivOpen access
Qiong LiDaoguang TuDingping Li
hep-thcond-mat.quant-gas
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Qiong LiDaoguang TuDingping Li

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