Now showing items 54-68 of 68

    Searching for P- and CP- odd effects in heavy ion collisions 

    Planells Noguera, Xumeu (Date of defense: 2014-11-06)

    In this thesis we study the possibility that QCD breaks parity at high temperatures and densities, a scenario that may be tested in heavy ion collisions. We present two different approaches to this problem. On the one hand, ...

    Self-consistent Green's functions with three-body forces 

    Carbone, Arianna (Date of defense: 2014-04-11)

    The quantum many-body problem is an everlasting challenge for theoretical physics. The aim sought is to analyze, at the quantum level, the observables arising from a group formed by a certain number of interacting particles ...

    Self-organization and cooperativity of cytoskeletal molecular motors 

    Oriola Santandreu, David (Date of defense: 2016-01-15)

    The present work deals with different aspects concerning the collective action of cytoskeletal molecular motors. The thesis is organized in two parts: the first part corresponds to the study of the cooperative action of ...

    Semiclassical approach to relativistic nuclear mean field theory 

    Centelles Aixalà, Mario (Date of defense: 1992-07-30)

    The nuclear many-body problem is nowadays being increasingly approached on the basis of a relativistic formalism. Microscopic Dirac-Brueckner-Hartree-Fock (DBHF) calculations starting from a realistic nucleon-nucleon ...

    Simulació Monte Carlo de sistemes amb acoblament de graus de llibertat 

    Vives i Santa-Eulàlia, Eduard (Date of defense: 1991-01-16)

    Els models microscòpics usuals que es proposen en Mecànica Estadística descriuen, únicament, un tipus de grau de llibertat. Aquests models permeten explicar algunes transicions de fase que es troben en els diagrames de ...

    Some theoretical and experimental aspects of axion physics 

    Renau Cerrillo, Albert (Date of defense: 2015-11-11)

    In this thesis we study axions, a byproduct of the Peccei-Quinn solution to the strong CP problem, which are also a viable candidate for the dark matter content of the Universe. In the first part of the thesis, we ...

    Spontaneous generation of geometry and its possible consequences 

    Puigdomènech Bourgon, Daniel (Date of defense: 2012-11-06)

    In this thesis a viable theory of gravity resulting from the spontaneous symmetry breaking of some more fundamental theory is developed. This fundamental theory does not include any notion of a metric or geometry. All the ...

    Stochastic Effects in Quorum Sensing 

    Weber, Marc (Date of defense: 2014-06-06)

    Stochastic fluctuations, or noise, are ubiquitous in biological systems and play an important role in many cellular processes. Experimental evidences have shown that noise affects the reliability of cell coordination in ...

    Structure and dynamics of liquid helium systems and their interaction with atomic dopants and free electrons 

    Mateo Valderrama, David (Date of defense: 2013-05-02)

    This thesis presents a collection of four papers published in peer-reviewed scientific journals plus a manuscript yet to be submitted, all of them in the field of low temperature physics and quantum fluids. Each of these ...

    The properties of antikaons in hot and dense matter 

    Tolós Rigueiro, Laura (Date of defense: 2003-05-09)

    Understanding the behavior of matter under extreme conditions of density and temperature, such as those found in neutron stars or in heavy-ion collisions, requires a good knowledge on the modification of the properties of ...

    Theories of modified gravity and reconstruction schemes of cosmological models 

    López Revelles, Antonio Jesús (Date of defense: 2013-11-08)

    En esta memoria de tesis se expone el trabajo llevado a cabo por el doctorando durante los últimos cuatro años, el cual versa principalmente sobre diversos aspectos de soluciones cosmológicas obtenidas a partir de teorías ...

    Thermodynamical Properties of Nuclear Matter from a newline Self-Consistent Green's Function Approach 

    Rios Huguet, Arnau (Date of defense: 2007-02-23)

    The main contribution of this thesis concerns the application of the Luttinger-Ward formalism to the study of the thermodynamical properties of nuclear matter. This formalism is devoted to compute the different thermodynamical ...

    Time Dependent Processes in Magnetic Systems 

    Iglesias, Oscar (Date of defense: 2002-05-24)

    En este trabajo se presentan modelos para el estudio de los procesos de dependencia en el tiempo de las propiedades magnéticas de diferentes tipos de materiales magnéticos, básicamente sistemas de partículas pequeñas y ...

    Topics in quantum Nanostructure Physics: Spin-Orbit effects and Far-Infrared Response 

    Malet Giralt, Francesc (Date of defense: 2008-05-13)

    We have investigated several properties of semiconductor electronic nanostructures. In the first part of the thesis, within the density functional theory we have addressed the ground state and the dipolar response of quantum ...

    Turbulent bubble suspensions and crystal growth in microgravity. Drop tower experiments and numerical simulations 

    Bitlloch Puigvert, Pau (Date of defense: 2012-10-11)

    We study the formation and spreading of a turbulent jet of bubbles in microgravity. This has been analyzed from the recordings obtained in previous experimental campaigns of microgravity. Results have been compared with a ...