Showing 1997Show all

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hep-th1997★ 3 cited

D0-Branes as Instantons in D=4 Super Yang-Mills Theories

J. L. F. Barbon, A. Pasquinucci

We discuss the role of D0-branes as instantons in the construction of SU(N) Super Yang-Mills and Super QCD theories in four space-time dimensions with D4-, D6- and NS-branes. [To a…

hep-th1997★ 4 cited

Special Kähler Geometry. Does there Exist a Prepotential?

B. Craps, F. Roose, W. Troost +1

A symplectically invariant definition of special Kähler geometry is discussed. Certain aspects hereof are illustrated by means of Calabi-Yau moduli spaces.

hep-ph1997

Low Energy Tests of the Standard Model from Beta-Decay and Muon Capture

Jan Govaerts

Two recent low energy precision experiments are considered, in order to illustrate how limits set by these measurements for couplings beyond the Standard Model are complementary to…

hep-th1997★ 150 cited

M 5-brane and superconformal (0,2) tensor multiplet in 6 dimensions

Piet Claus, Renata Kallosh, Antoine Van Proeyen

We present a gauge-fixed M 5-brane action: a 6-dimensional field theory of a self-interacting (0,2) tensor multiplet with 32 worldvolume supersymmetries. The quadratic part of this…

hep-th1997★ 209 cited

Microscopic derivation of the Bekenstein-Hawking entropy formula for non-extremal black holes

K. Sfetsos, K. Skenderis

We derive the Bekenstein-Hawking entropy formula for four and five dimensional non-supersymmetric black holes (which include the Schwarzchild ones) by counting microscopic states.…

hep-th1997★ 13 cited

Softly Broken MQCD and the Theta Angle

J. L. F. Barbon, A. Pasquinucci

We consider a family of non-supersymmetric MQCD five-brane configurations introduced by Witten, and discuss the dependence of the curves on the microscopic theta angle and its rela…

hep-th1997★ 1 cited

On the Evaluation of Compton Scattering Amplitudes in String Theory

A. Pasquinucci, M. Petrini

We consider the Compton amplitude for the scattering of a photon and a (massless) ``electron/positron'' at one loop (i.e. genus one) in a four-dimensional fermionic heterotic strin…

hep-th1997★ 17 cited

The nonminimal scalar multiplet: duality, sigma-model, beta-function

Silvia Penati, Andrea Refolli, Antoine Van Proeyen +1

We compute in superspace the one-loop beta-function for the nonlinear sigma-model defined in terms of the nonminimal scalar multiplet. The recently proposed quantization of this co…

cond-mat1997★ 28 cited

Density Profiles, Casimir Amplitudes and Critical Exponents in the Two Dimensional Potts Model: A Density Matrix Renormalization Study

Enrico Carlon, Ferenc Igloi

We use the density matrix renormalization group (DMRG) to perform a detailed study of the critical properties of the two dimensional Q state Potts model, including the magnetizatio…

hep-ph1997★ 3 cited

Further remarks on isospin breaking in charmless semileptonic B decays

G. Lopez Castro, J. H. Munoz, G. Toledo Sanchez

We consider the isospin breaking corrections to charmless semileptonic decays of B mesons. Both, the recently measured branching ratios of exclusive decays by the CLEO Collaboratio…

cond-mat.stat-mech1997★ 27 cited

Critical point shift in a fluid confined between opposing walls

Enrico Carlon, Andrzej Drzewinski

The properties of a fluid, or Ising magnet, confined in a geometry with opposing surface fields at the walls are studied by density matrix renormalization techniq…

hep-ph1997★ 76 cited

A Precision Measurement of Nuclear Muon Capture on 3He

P. Ackerbauer, D. V. Balin, V. M. Baturin +27

The muon capture rate in the reaction mu- 3He -> nu + 3H has been measured at PSI using a modular high pressure ionization chamber. The rate corresponding to statistical hyperfine…

hep-th1997★ 52 cited

Special geometry in hypermultiplets

J. De Jaegher, B. de Wit, B. Kleijn +1

We give a detailed analysis of pairs of vector and hypermultiplet theories with N=2 supersymmetry in four spacetime dimensions that are related by the (classical) mirror map. The s…

hep-th1997★ 84 cited

Duality and asymptotic geometries

H. J. Boonstra, B. Peeters, K. Skenderis

We consider a series of duality transformations that leads to a constant shift in the harmonic functions appearing in the description of a configuration of branes. This way, for se…

cond-mat.mtrl-sci1997★ 131 cited

The long-wavelength behaviour of the exchange-correlation kernel in the Kohn-Sham theory of periodic systems

Ph. Ghosez, X. Gonze, R. W. Godby

The polarization-dependence of the exchange-correlation (XC) energy functional of periodic insulators within Kohn-Sham (KS) density-functional theory requires a …

cond-mat1997★ 12 cited

Stability of Uniform Shear Flow

Jose M. Montanero, Andres Santos, Mirim Lee +2

The stability of idealized shear flow at long wavelengths is studied in detail. A hydrodynamic analysis at the level of the Navier-Stokes equation for small shear rates is given to…

cond-mat.dis-nn1997★ 4 cited

Categorization by a three-state attractor neural network

D. R. C. Dominguez, D. Bollé

The categorization properties of an attractor network of three-state neurons which infers three-state concepts from examples are studied. The evolution equations governing the para…

cond-mat.dis-nn1997★ 1 cited

Parallel dynamics of fully connected Q-Ising neural networks

D. Bollé, G. Jongen, G. M. Shim

Using a probabilistic approach we study the parallel dynamics of fully connected Q-Ising neural networks for arbitrary Q. A Lyapunov function is shown to exist at zero temperature.…

hep-th1997★ 12 cited

Self-Dual Supergravity from N=2 Strings

J. de Boer, K. Skenderis

A new heterotic N=2 string with manifest target space supersymmetry is constructed by combining a conventional N=2 string in the right-moving sector and a Green-Schwarz-Berkovits t…

gr-qc1997★ 52 cited

Marginally Trapped Surfaces in the Nonsymmetric Gravitational Theory

L. Demopoulos, J. Legare

We consider a simple, physical approach to the problem of marginally trapped surfaces in the Nonsymmetric Gravitational Theory (NGT). We apply this approach to a particular spheric…

hep-th1997★ 14 cited

Quantization of the complex linear superfield

M. Grisaru, A. Van Proeyen, D. Zanon

The quantization of the complex linear superfield requires an infinite tower of ghosts. We use the Batalin-Vilkovisky method to obtain a gauge-fixed action. In superspace, the meth…

hep-th1997★ 113 cited

What is Special Kähler Geometry ?

B. Craps, F. Roose, W. Troost +1

The scalars in vector multiplets of N=2 supersymmetric theories in 4 dimensions exhibit `special Kaehler geometry', related to duality symmetries, due to their coupling to the vect…

cond-mat.stat-mech1997★ 41 cited

Effect of Gravity and Confinement on Phase Equilibria: A Density Matrix Renormalization Approach

Enrico Carlon, Andrzej Drzewinski

The phase diagram of the 2D Ising model confined between two infinite walls and subject to opposing surface fields and to a bulk "gravitational" field is calculated by means of den…

cond-mat.stat-mech1997

Networks of Steps on Au and Pt Crystals

Henk van Beijeren, Enrico Carlon

Networks of steps, seen in STM observations of vicinal surfaces on Au and Pt (110), are analyzed. A simple model is introduced for the calculation of the free energy of the network…