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

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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. 
@article{TMF_2002_131_1_a1,
     author = {M. Bordag and V. V. Skalozub},
     title = {Summing {Superdaisy} {Diagrams} in the $O(N)${-Model} near the {Phase} {Transition} {Temperature}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
     volume = {131},
     number = {1},
     year = {2002},
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     url = {http://geodesic.mathdoc.fr/item/TMF_2002_131_1_a1/}
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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/