Université Paris-Sud

output

19922026

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

collaborating institutions

Showing 1994Show all

51 papers · 1 filter

hep-lat1994★ 4 cited

Results from a Non-Perturbative Renormalization of Lattice Operators

G. Martinelli, C. Pittori, C. T. Sachrajda +2

We propose a general renormalization method, which avoids completely the use of lattice perturbation theory. We present the results from its numerical applications to two-fermion o…

hep-th1994★ 43 cited

Linear connections on matrix geometries

J. Madore, T. Masson, J. Mourad

A general definition of a linear connection in noncommutative geometry has been recently proposed. Two examples are given of linear connections in noncommutative geometries which a…

cond-mat1994★ 3 cited

Mean-field theory of a quasi-one-dimensional superconductor in a high magnetic field

N. Dupuis

At high magnetic field, the semiclassical approximation which underlies the Ginzburg-Landau (GL) theory of the mixed state of type II superconductors breaks down. In a quasi-1D sup…

cond-mat1994★ 29 cited

Electron-electron interactions in one- and three-dimensional mesoscopic disordered rings: a perturbative approach

Michel Ramin, Bertrand Reulet, Helene Bouchiat

We have computed persistent currents in a disordered mesoscopic ring in the presence of small electron-electron interactions, treated in first order perturbation theory. We have in…

cond-mat1994★ 194 cited

Phases of two coupled Luttinger liquids

H. J. Schulz

A model of two interacting one--dimensional fermion systems (``Luttinger liquids'') coupled by single--particle hopping is investigated. Bosonization allows a number of exact state…

hep-ph1994★ 400 cited

Induced Gluon Radiation in a QCD Medium

R. Baier, Yu. L. Dokshitzer, S. Peigné +1

Soft gluon radiation induced by multiple scattering of a fast quark or gluon propagating through QCD matter is discussed. After revisiting the Landau-Pomeranchuk-Migdal effect in Q…

hep-ph1994★ 28 cited

Supersymmetric Models with a Gauge Singlet and Non-Universal Soft Terms from Orbifold String Theory

Ph. Brax, U. Ellwanger, C. A. Savoy

The particle spectrum of the supersymmetric extension of the standard model with a gauge singlet is studied. Soft supersymmetry breaking terms are explicitly chosen to be non-unive…

acc-phys1994★ 8 cited

High-Brightness Photocathode Electron Sources

C. Travier

Most present and future electron accelerators require bright sources. Invented less than ten years ago, the photo-injector the principle of which is briefly recalled, has already d…

cond-mat1994★ 15 cited

Fractional Spin for Quantum Hall Effect Quasiparticles

T. Einarsson, S. L. Sondhi, S. M. Girvin +1

We investigate the issue of whether quasiparticles in the fractional quantum Hall effect possess a fractional intrinsic spin. The presence of such a spin $S$ is suggested by the sp…

cond-mat1994★ 147 cited

Does the attractive Hubbard model support larger persistent currents than the repulsive one ?

T. Giamarchi, B. S. Shastry

We consider a one-dimensional Hubbard model in the presence of disorder. We compute the charge stiffness for a mesoscopic ring, as a function of the size $L$ , which is a measure of…

cond-mat1994★ 3 cited

Functional Integrals for Correlated Fermions

H. J. Schulz

Functional integral methods provide a way to define mean--field theories and to systematically improve them. For the Hubbard model and similar strong--correlation problems, methods…

hep-lat1994★ 692 cited

A General Method for Non-Perturbative Renormalization of Lattice Operators

G. Martinelli, C. Pittori, C. T. Sachrajda +2

We propose a non-perturbative method for computing the renormalization constants of generic composite operators. This method is intended to reduce some systematic errors, which are…

cond-mat1994★ 39 cited

Vibrational Study of 13C-enriched C60 Crystals

Michael C. Martin, J. Fabian, J. Godard +3

The infrared (IR) spectrum of solid C60 exhibits many weak vibrational modes. Symmetry breaking due to 13C isotopes provides a possible route for optically activating IR-silent vib…

hep-th1994★ 68 cited

Linear connections on the quantum plane

Michel Dubois-Violette, John Madore, Thierry Masson +1

A general definition has been proposed recently of a linear connection and a metric in noncommutative geometry. It is shown that to within normalization there is a unique linear co…

cond-mat1994★ 81 cited

Direct Calculation of the Spin Stiffness in the $J_{1}$ -- $J_{2}$ Heisenberg Antiferromagnet

T. Einarsson, H. J. Schulz

We calculate the spin stiffness $ρ_{s}$ for the frustrated spin- $\frac{1}{2}$ Heisenberg antiferromagnet on a square lattice by exact diagonalizations on finite clusters of up to $36…

cond-mat1994★ 52 cited

Larkin-Ovchinnikov-Fulde-Ferrell state in quasi-one-dimensional superconductors

N. Dupuis

The properties of a quasi-one-dimensional (quasi-1D) superconductor with {\it an open Fermi surface} are expected to be unusual in a magnetic field. On the one hand, the quasi-1D s…

hep-th1994

Nambu mass hierarchies in low energy string models

E. Dudas

This paper explores a recent idea of Nambu to generate hierarchies among Yukawa couplings in the context of effective supergravity and superstrings models. The Yukawa couplings are…

hep-ex1994★ 2 cited

Determination of the branching ratios $Γ (K_{L} \to 3 π^{0}) /Γ (K_{L} \to π^{+} π^{-} π^{0})$ and $Γ (K_{L} \to 3 π^{0}) /Γ (K_{L} \to π e ν)$

A. Kreutz, M. Holder, M. Rost +27

Improved branching ratios were measured for the $K_{L} \to 3 π^{0}$ decay in a neutral beam at the CERN SPS with the NA31 detector: $Γ(K_L \to 3 π^0) / Γ(K_L \to π^+ π^- π^0) = 1.611…

math.CO1994★ 12 cited

Restricted routing and wide diameter of the cycle prefix network

William Y. C. Chen, Vance Faber, Emanuel Knill

The cycle prefix network is a Cayley coset digraph based on sequences over an alphabet which has been proposed as a vertex symmetric communication network. This network has been sh…

cond-mat1994★ 14 cited

Chiral and Spin Order in the 2D \pm J Xy Spin Glass : Domain Wall Scaling Analysis

M. Ney-Nifle, H. J. Hilhorst

This is an analytic study of the two-dimensional XY spin glass with $\pm J$ disorder. The Hamiltonian has a continuous spin symmetry and a discrete chiral symmetry, and therefore p…

hep-th1994★ 12 cited

$S U_{3}$ coherent state operators and invariant correlation functions and their quantum group counterparts

H. Sazdjian, Y. S. Stanev, I. T. Todorov

Coherent state operators (CSO) are defined as operator valued functions on G=SL(n,C), homogeneous with respect to right multiplication by lower triangular matrices. They act on a m…

cond-mat1994★ 47 cited

Transport properties of a quantum wire in the presence of impurities and long-range Coulomb forces

H. Maurey, T. Giamarchi

One-dimensional electron systems interacting with long-range Coulomb forces (quantum wires) show a Wigner crystal structure. We investigate in this paper the transport properties o…

hep-ph1994★ 47 cited

Critical Analysis of Theoretical Estimates for $B$ to Light Meson Form Factors and the $B \to ψ K (K^{*})$ Data

R. Aleksan, A. Le Yaouanc, L. Oliver +2

We point out that current estimates of form factors fail to explain the non-leptonic decays $B \to ψ K (K^{*})$ and that the combination of data on the semi-leptonic decays $D \to…

hep-ph1994★ 4 cited

Determination of the CP Violating Phase $γ$ by a Sum Over Common Decay Modes to $B_{s}$ and $B ˉ_{s}$