NEVEU Andre
Fonction : Directeur de Recherches émérite
Emerite CNRS
Andre.NEVEU
umontpellier.fr
Bureau: 39, Etg: 1, Bât: 13 - Site : Campus Triolet
Domaines de Recherche: - Physique/Physique des Hautes Energies - Théorie
|
Dernieres productions scientifiques :
|
|
Perturbatively conserved higher nonlocal integral invariants of free-surface deep-water gravity waves 
Auteur(s): Neveu A.
(Article) Publié:
Physics Of Fluids, vol. 33 p.032105 (2021)
Texte intégral en Openaccess : 
Ref HAL: hal-03252526_v1
DOI: 10.1063/5.0039868
WoS: 000630507900001
Exporter : BibTex | endNote
Résumé: We exhibit a set of six explicit higher nonlocal integral invariants of free-surface deep-water gravity waves conservedin lowest nontrivial orders of perturbation in the amplitude of the surface displacement.
|
|
|
|
Chiral Condensate and Spectral Density at full five-loop and partial six-loop orders of Renormalization Group Optimized Perturbation
Auteur(s): Kneur J.-L., Neveu A.
(Article) Publié:
Physical Review D, vol. p.074009 (2020)
Texte intégral en Openaccess :
Ref HAL: hal-02464734_v1
Ref Arxiv: 2001.11670
DOI: 10.1103/PhysRevD.101.074009
WoS: 000525109000003
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: We reconsider our former determination of the chiral quark condensate $\langle \bar q q \rangle$ from the related QCD spectral density of the Euclidean Dirac operator, using our Renormalization Group Optimized Perturbation (RGOPT) approach. Thanks to the recently available {\em complete} five-loop QCD RG coefficients, and some other related four-loop results, we can extend our calculations exactly to $N^4LO$ (five-loops) RGOPT, and partially to $N^5LO$ (six-loops), the latter within a well-defined approximation accounting for all six-loop contents exactly predictable from five-loops RG properties. The RGOPT results overall show a very good stability and convergence, giving primarily the RG invariant condensate, $\langle \bar q q\rangle^{1/3}_{RGI}(n_f=0) = -(0.840_{-0.016}^{+0.020}) \bar\Lambda_0 $, $\langle\bar q q\rangle^{1/3}_{RGI}(n_f=2) = -(0.781_{-0.009}^{+0.019}) \bar\Lambda_2 $, $\langle\bar q q\rangle^{1/3}_{RGI}(n_f=3) = -(0.751_{-.010}^{+0.019}) \bar\Lambda_3 $, where $\bar\Lambda_{n_f}$ is the basic QCD scale in the \overline{MS} scheme for $n_f$ quark flavors, and the range spanned is our rather conservative estimated theoretical error. This leads {\it e.g.} to $ \langle\bar q q\rangle^{1/3}_{n_f=3}(2\, {\rm GeV}) = -(273^{+7}_{-4}\pm 13)$ MeV, using the latest $\bar\Lambda_3$ values giving the second uncertainties. We compare our results with some other recent determinations. As a by-product of our analysis we also provide complete five-loop and partial six-loop expressions of the perturbative QCD spectral density, that may be useful for other purposes.
|
|
|
|
The dawn of Supersymmetry
Auteur(s): Neveu A.
Conférence invité: 50 years of the Veneziano model: from dual models and strings, M-theory and beyond (Florence, IT, 2018-05-11)
Ref HAL: hal-01938198_v1
Exporter : BibTex | endNote
Résumé: How the Neveu-Schwarz string was discovered is the result of a most unlikely sequence of four coincidences.
|
|
|
|
A Backlund Transformation for Elliptic Four-Point Conformal Blocks
Auteur(s): Neveu A.
(Article) Publié:
Reviews In Mathematical Physics, vol. 30 p.1840012 (2018)
Texte intégral en Openaccess :
Ref HAL: hal-01924596_v1
DOI: 10.1142/S0129055X18400123
WoS: WOS:000439964100006
Exporter : BibTex | endNote
Résumé: We apply an integral transformation to solutions of a partial differential equa-tion for the five-point correlation functions in Liouville theory on a sphere withone degenerate field $V_{ − 1/(2b)}$ . By repeating this transformation, we can reach a whole lattice of values for the conformal dimensions of the four other operators. Factorizing out the degenerate field leads to integral representations of the corresponding four-point conformal blocks. We illustrate this procedure on the elliptic conformal blocks discovered in a previous publication.
|
|
|
|
A Bäcklund transformation for elliptic four-point conformal blocks
Auteur(s): Neveu A.
(Document sans référence bibliographique) Texte intégral en Openaccess :
Ref HAL: hal-01757993_v1
Ref Arxiv: 1803.03564
Ref INSPIRE: 1659300
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: We apply an integral transformation to solutions of a partial differential equation for five-point correlation functions in Liouville theory on a sphere with one degenerate field $V_{-\frac{1}{2b}}$. By repeating this transformation, we can reach a whole lattice of values for the conformal dimensions of the four other operators. Factorizing out the degenerate field leads to integral representations of the corresponding four-point conformal blocks. We illustrate this procedure on the elliptic conformal blocks discovered in a previous publication.
|
Plus...
Vcard
