Abstract
These lectures are centered around a specific problem, the effect of weak repulsive interactions on the transition temperature \(T_c\) of a Bose gas. This problem provides indeed a beautiful illustration of many of the techniques which have been discussed at this school on effective theories and renormalization group. Effective theories are used first in order to obtain a simple hamiltonian describing the atomic interactions: because the typical atomic interaction potentials are short range, and the systems that we consider are dilute, these potentials can be replaced by a contact interaction whose strength is determined by the \(s\)-wave scattering length. Effective theories are used next in order to obtain a simple formula for the shift in \(T_c\): this comes from the fact that near \(T_c\) the physics is dominated by low momentum modes whose dynamics is most economically described in terms of classical fields. The ingredients needed to calculate the shift of \(T_c\) can be obtained from this classical field theory. Finally the renormalization group is used both to obtain a qualitative understanding, and also as a non perturbative tool to evaluate quantitatively the shift in \(T_c\).
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Notes
- 1.
Note that depending on the choice of the regulator, not all fluctuations may be suppressed when \(\kappa =\Lambda \). However, for renormalisable theories, and if \(\Lambda \) is large enough, the effects of these remnant fluctuations can be absorbed into a redefinition of the parameters of the classical action.
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Acknowledgements
Most of the material of these lectures is drawn from work done in a most enjoyable collaboration with several people during these last years: G. Baym, F. Laloë, M. Holzmann, R. Mendez-Galain, D. Vautherin, N. Wschebor and J. Zinn-Justin. I would also like to express my gratitude to Achim Schwenk for insisting on having these lecture notes....and putting such a high cut-off on his patience as he waited for them.
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Blaizot, JP. (2012). Nonperturbative Renormalization Group and Bose-Einstein Condensation. In: Schwenk, A., Polonyi, J. (eds) Renormalization Group and Effective Field Theory Approaches to Many-Body Systems. Lecture Notes in Physics, vol 852. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27320-9_1
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