Universitat de Barcelona
Now showing items 1-20 of 53
However successful classical general relativity is, it faces non-normalizability problems at the quantum mechanical level. Nevertheless, it predicts the existence of black holes, which are thermal objects that are expected ...
En el estudio de la Física del Plasma y, más concretamente, en la llamada aproximación del centro guía se trata el problema del movimiento de partículas cargadas en un campo magnético variable. Los resultados obtenidos se ...
The main goal of this thesis is to study the physical mechanisms implicated in the self-assembly and mechanical properties of non-enveloped viral capsids using coarse-grained models. The thesis has been divided into three ...
It is known that active particles induce emerging patterns as a result of their dynamic interactions, giving rise to amazing collective motions, such as swarming or clustering. Here we present a systematic numerical study ...
Thesis investigates the dynamics of financial markets. Nowadays, this is one of the emergent fields in physics and requires a multidisciplinary approach. The thesis studies the first work made by the financial mathematicians ...
In this thesis we have made progress on the study of higher dimensional gravity by focusing on the properties of black holes and branes and their dynamics. We have developed two main projects: • provide several maps ...
In this thesis we push forward techniques to learn about the large scale structure formation of the universe. The approach is from theory, observations and simulations. From theory we study the growth of four non standard ...
In this thesis we study the Einstein-Aether (E-A) theory from the point of view of its cosmological perturbations. We are interested in the constraints that may be obtained from this analysis and the special features that ...
El objetivo de esta tesis es construir un modelo cuántico para las ondas gravitatorias planas, unas soluciones de vacío de las ecuaciones de Einstein que presentan simetrías análogas a las ondas electromagnéticas en un ...
The work presented in this thesis consists of two distinct parts. The first years of my work focused on the development and improvement of a new equipment built to study magnetic and electrical properties, particularly ...
Our main goal is to study certain aspects of the dynamics of fluids with magnetic particles in suspension, based on their promising practical applications as new materials as welI as on its fundamental scientific interest. In ...
S'ha obtingut la comprensió dels fenòmens donant lloc a l'ordenament magnètic i l'anisotropia magnetocristal.lina de ferrites hexagonals uniaxials. S'han realitzat mesures de difracció de raigs X i de neutrons (per afinar ...
Els sistemes de baixa dimensionalitat han sigut i són atractius als física per diverses raons: - A nivell estrictament teòric són els sistemes més senzills d'estudiar, i, de fet, molts models no trivials en tres dimensions ...
Aquesta tesi està dedicada a l'estudi de les explicacions dels fenòmens físics relacionats amb el pes, la calor i l'aigua, ofertes pel poema De rerum Natura de l'atomista epicuri llatí Lucreci (Titus Lucretius Carus, ...
In this thesis we characterize the behavior of molecular motors when the properties of the cytoplasm they displace through are not homogeneous or isotropic. Anisotropies in the cytoplasm can be induced, for example, by net ...
La Física Cuántica descansa sobre el principio de indeterminación que nos dice que no podemos conocer con total precisión y a la vez la posición y la velocidad de un objeto. Una consecuencia de la indeterminación en la ...
Partiendo de una formulación general de los procesos de transporte con dinámicas acopladas, se estudian tres sistemas distintos que presentan esta propiedad: el transporte de luz en medios desordenados, los fenómenos de ...
Single-molecule techniques allow to following biomolecular reactions with unprecedented resolution. Particularly, optical tweezers can be used to manipulate and apply forces to individual molecules tethered between plastic ...
La pregunta que ha inspirado que ha venido a dar en este trabajo ha sido: ¿Qué papel tuvo la hipótesis adiabática de Paul Ehrenfest en el desarrollo de la teoría cuántica? Para ello se ha tratado de precisar el significado ...
Disorder is present in many systems in nature and in many different versions. For instance, the dislocations of a crystal lattice, or the randomness of the interaction between magnetic moments. One of the most studied ...
