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2008

Functional renormalization for Bose-Einstein Condensation

Floerchinger, S., Wetterich, C.

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We investigate Bose-Einstein condensation for interacting bosons at zero and nonzero temperature.

Functional renormalization provides us with a consistent method to compute the effect of fluctuations beyond the Bogoliubov approximation.
For three dimensional dilute gases, we find an upper bound on the scattering length a which is of the order of the microphysical scale - typically the range of the Van der Waals interaction.
In contrast to fermions near the unitary bound, no strong interactions occur for bosons with approximately pointlike interactions, thus explaining the high quantitative reliability of perturbation theory for most quantities.

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C. Wetterich, arXiv:0712.1926 [cond-mat.stat-mech]
Original
1926
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