Concept

Théorie de De Broglie-Bohm

Publications associées (51)

Dot trajectories in the superposition of random screens: Analysis and synthesis

Moire effects that occur in the superposition of aperiodic layers such as correlated random dot screens are known as Glass patterns. One of the most interesting properties of such moire effects, which clearly distinguish them from their periodic counterpar ...

Optical Society of America, Washington, United States2004

Nonlocal plasticity models for localized failure

Simon Rolshoven

In quasi-brittle materials such as concrete, failure is preceded by highly localized deformation patterns. Localized failure is caused by strain softening, which cannot be described by classical local models, because they lack a length scale. Mathematicall ...

EPFL2003

Sigma-model symmetry in orientifold models

Claudio Scrucca

We investigate in the simplest compact D = 4 N = 1 type-II B orientifold models the sigma-model symmetry suggested by the proposed duality of these models to heterotic orbifold vacua. This symmetry is known to be present at the classical level, and is asso ...

2000

Aspects of D-brane dynamics on orbifolds

Claudio Scrucca

We discuss D-brane dynamics in orbifold compactifications of type II superstring theory. We compute the interaction potential between two D-branes moving with constant velocities and give a field theory interpretation of it in the large distance limit. ...

1999

Scale-independent spin effects in D-brane dynamics

Claudio Scrucca

We study spin interactions between two moving D-branes using the Green-Schwarz formalism of boundary states. We focus our attention on the leading terms for small velocities v, of the form v(4-n)/r(7-P+n) (v(2-n)/r(3-p+n)) for p-p (p-p + 4) systems, with 1 ...

1998

Dynamical charge tensors and infrared spectrum of amorphous SiO2

Alfredo Pasquarello, Roberto Car

Using a model structure consisting of a network of corner sharing tetrahedra, we calculate the infrared spectrum of amorphous SiO2 within a first-principles approach and find good agreement with experiment both for the positions and the intensities of the ...

1997

L'inférence conditionnelle en statistique multivariée

Dans ce rapport, nous présentons une manière inhabituelle de traiter des données multidimensionnelles. Plus exactement, nous expliquons comment tirer des conclusions sur les paramètres de la loi multivariée sous-jacente, en utilisant une technique déjà pré ...

1996

Stochastics and their role in structural performance

William Curtin

The influence of random microstructures and strengths on mechanical performance of advanced ceramics is now being recognized as critical. Experimental results on new ceramics demonstrate the importance of stochastic phenomena, particularly in fiber-reinfor ...

1996

Photoemission in low-dimensional systems

Marco Grioni, Helmuth Berger

We briefly review some recent photoelectron spectroscopy (PES) studies of quasi one- and two-dimensional metallic systems. We discuss the spectral features of a metallic system, the expected fingerprints of the metal-insulator transition and some experimen ...

1996

Quantum-Well Excitons In Semiconductor Microcavities - Unified Treatment Of Weak And Strong-Coupling Regimes

Vincenzo Savona, Paolo Schwendimann

The system of one or several quantum wells embedded in a planar semiconductor Fabry-Perot microcavity with distributed Bragg reflectors is studied in the framework of both a semiclassical and a full quantum theory. The results obtained with the two treatme ...

1995

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