Asymptotes in SU(2) recoupling theory: Wigner matrices, 3j symbols, and character localization
In this paper, we employ a technique combining the Euler Maclaurin formula with the saddle point approximation method to obtain the asymptotic behavior (in the limit of large representation index J) of generic Wigner matrix elements $${D^{J}_{MM'}(g)}$$. We use this result to derive asymptotic...
Gespeichert in:
| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
January 19, 2011
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| In: |
Annales Henri Poincaré
Year: 2011, Jahrgang: 12, Heft: 1, Pages: 77-118 |
| ISSN: | 1424-0661 |
| DOI: | 10.1007/s00023-010-0072-1 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/s00023-010-0072-1
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| Verfasserangaben: | Joseph Ben Geloun and Razvan Gurau |
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| 245 | 1 | 0 | |a Asymptotes in SU(2) recoupling theory |b Wigner matrices, 3j symbols, and character localization |c Joseph Ben Geloun and Razvan Gurau |
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| 520 | |a In this paper, we employ a technique combining the Euler Maclaurin formula with the saddle point approximation method to obtain the asymptotic behavior (in the limit of large representation index J) of generic Wigner matrix elements $${D^{J}_{MM'}(g)}$$. We use this result to derive asymptotic formulae for the character χJ(g) of an SU(2) group element and for Wigner’s 3j symbol. Surprisingly, given that we perform five successive layers of approximations, the asymptotic formula we obtain for χJ(g) is in fact exact. The result hints at a “Duistermaat-Heckman like” localization property for discrete sums. | ||
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