Geodesic
Summing Superdaisy Diagrams in the $O(N)$-Model near the Phase Transition Temperature
Teoretičeskaâ i matematičeskaâ fizika, Tome 131 (2002) no. 1, pp. 4-14 Cet article a éte moissonné depuis la source Math-Net.Ru

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We investigate the phase transition temperature in the $N$-component scalar field theory. We obtain a weakly first-order phase transition in the superdaisy approximation; it becomes a second-order phase transition as $N\to\infty$. This is compared with other approaches. 
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M. Bordag; V. V. Skalozub. Summing Superdaisy Diagrams in the $O(N)$-Model near the Phase Transition Temperature. Teoretičeskaâ i matematičeskaâ fizika, Tome 131 (2002) no. 1, pp. 4-14. http://geodesic.mathdoc.fr/item/TMF_2002_131_1_a1/

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