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Critical exponents of O(N) models in fractional dimensions · Around

2014

Critical exponents of O(N) models in fractional dimensions

Codello, A., Defenu, N., D'Odorico, G.

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We compute critical exponents of O(N) models in fractal dimensions between two and four, and for continuos values of the number of field components N, in this way completing the RG classification of universality classes for these models.

In d=2 the N-dependence of the correlation length critical exponent gives us the last piece of information needed to establish a RG derivation of the Mermin-Wagner theorem.
We also report critical exponents for multi-critical universality classes in the cases N>1 and N=0.
Finally, in the large-N limit our critical exponents correctly approach those of the spherical model, allowing us to set N~100 as threshold for the quantitative validity of leading order large-N estimates.

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2012
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S. El-Showk, M. F. Paulos, D. Poland, S. Rychkov, D. Simmons-Duffin and A. Vichi, Phys. Rev. D 86
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2012
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A. Codello and G. D’Odorico, Phys. Rev. Lett. 110
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R. Percacci and G. P. Vacca, arXiv:1405.6622 [hep-th]

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L. Fei, S. Giombi and I. R. Klebanov, arXiv:1404.1094 [hep-th]; Y. Nakayama and T. Ohtsuki, arXiv:1404.5201 [hep-th]

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S. El-Showk, M. Paulos, D. Poland, S. Rychkov, D. Simmons-Duffin and A. Vichi, arXiv:1309.5089 [hep-th]

Cited in the paper.

M.C. Angelini, G. Parisi and F. Ricci-Tersenghi, arXiv:1401.6805 [cond-mat.stat-mech]; N. Defenu, A. Trombettoni and A. Codello, arXiv:1409.8322 [cond-mat.stat-mech]

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2013

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2014

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