Universitat de Barcelona
Mostrando ítems 1-20 de 68
The AdS/CFT correspondence is one of the most important developments in the history of theoretical physics. Using as a binding bridge superstring theory, or, more concretely, some theoretical aspects in the interaction ...
The study of supersymmetry has led us to a better understanding of field theories, specially in the strong coupling regime. In this thesis we have tried to show this through several examples. These are: - The first of ...
The sequence of chapters can be divided into three blocks. - The first block contains the introductory chapters. In chapter 1 we illustrate the problem of the high-Tc superconductors making a parallelism between the ...
Instead of a linear and smooth evolution, many physical system react to external stimuli in avalanche dynamics. When an out of equilibrium system governed by disorder is externally driven the evolution of internal variables ...
This PhD thesis represents an advance in the present understanding of the spatiotemporal control of model plant Arabidopsis thaliana root growth and development. The size and structure of a living organism are tightly ...
In this thesis we have studied baryon resonances generated from the dynamical interaction of two hadrons. We are interested on this study as an alternative approach to explain the increasing number of observed charmed ...
En esta tesis se reformulan de manera detallada la primera aproximación de Born relativista con ondas planas (PWBA), para colisiones inelásticas de electrones, positrones y partículas pesadas con átomos o iones, suponiendo ...
Hay un gran número de aleaciones que experimentan transformaciones martensíticas termoelásticas (Au-Cd, Ti-Ni, Cu- Zn- Al, Cu- Al- Mo) y, en consecuencia, presentan ciertas propiedades termomecánicas que los convierten en ...
The purpose of this thesis is to study, within the framework of Brueckner-Hartree-Fock theory, properties of finite (hypernuclei) and infinite (hyperonic matter) nuclear many-body systems with hyperonic degrees of freedom, ...
Cells, either as unicellular organisms or as part of a tissue of a multicellular organism, can acquire different functions thanks to their capability of changing their expression state. The enzyme synthesis, cell division ...
In this thesis we study the effects of the dipole-dipole interaction on the physics of ultracold quantum gases, both bosonic and fermionic, within the theoretical framework provided by the mean-field regime. This kind of ...
LHCb is one of the four large experiments of the Large Hadron Collider (LHC) based at CERN. The LHCb experiment is taking data at its nominal design luminosity. However, in order to distinguish among models of new physics, ...
Quantum cryptography is one of the most important quantum information applications. The present thesis covers several topics on quantum cryptography, such as the security analysis of quantum channels for key distribution ...
THESIS SUMMARY<br/><br/>TEXT:<br/><br/>This thesis is made of two parts. In the first one, the issue of entanglement in many body systems is addressed. The concept of entanglement and some of the recent progress on the ...
From the seminal ideas of Feynman and until now, quantum information and computation has been a rapidly evolving field. While at the beginning, physicists looked at quantum mechanics as a theoretical framework to describe ...
Els sistemes objecte d'estudi en aquest treball són aliatges metàl·lics d'estructura reticular b.c.c. els quals, a baixes temperatures, experimenten una transició de fase estructural de tipus martensític (bàsicament descrita ...
La imbibició és un procés de transport de fluids immiscibles en un medi desordenat en el qual el fluid que mulla preferentment el medi desplaça el fluid resident. La interfície que separa aquests dos fluids esta sotmesa a ...
La caracterización de sistemas por medio de sus tiempos característicos es sujeto de investigación tanto teórica como experimental. Posiblemente el tiempo característico más conocido y más ampliamente utilizado es el Tiempo ...
En esta tesis se han estudiado algunos aspectos de sistemas que presentan transiciones de fase. Para ello se ha empleado tanto un enfoque experimental como teórico. En particular, se han investigado algunas transiciones ...
We have performed pattern formation experiments where a relatively well understood system (flow in a Hele-Shaw cell) is perturbed either by means of a lattice of grooves or by the use of viscoelastic fluids. We have extended ...
