Universitat de Barcelona
La Universitat de Barcelona és la universitat pública principal de Catalunya, amb el nombre més gran d’estudiants i l’oferta formativa més àmplia i completa. A més, és el principal centre de recerca universitari de l’Estat i un dels més importants d’Europa, tant per nombre de programes de recerca com per l’excel·lència assolida en aquest terreny.Estretament vinculada a la història de Barcelona i de Catalunya, la UB combina els valors de la tradició amb el fet de ser una institució innovadora i d’excel·lència en l’àmbit docent, i és una universitat urbana, oberta i cosmopolita com la mateixa ciutat de Barcelona.Us convidem a conèixer la Universitat de Barcelona!
Si sou doctor o doctora de la Universitat de Barcelona i voleu publicar la vostra tesi a TDX, contacteu amb tdx@ub.edu. Per a més informació consulteu les preguntes més freqüents
[eng] Since the first experimental evidence for the existence of gravitational waves in 2015, the amount of data in this scientific area has increased enormously. There has also been a great deal of interest in the ...
[eng] The more clearly visible galaxies to the naked eye in the night sky are the Magellanic Clouds (MC), the biggest galaxies in the Milky Way (MW) neighbourhood. Because they are so close, the Large and Small Magellanic ...
[eng] Astronomers have known of the existence of lenticular galaxies (S0) almost as long as they have known that there are other galaxies besides the Milky Way. While it is accepted that spiral galaxies emerge from the ...
[eng] From the observation of the cosmic microwave background radiation (CMBR) we know that the universe is isotropic on scales larger than ∼ 75 Megaparsec to at least one part in 100000. The leading paradigm for explaining ...
[eng] In this Thesis we explore exotic phases of matter which arise when different mechanisms compete and favor different ground state configurations. We focus on two classes of low dimensional lattice systems. The first ...
[eng] The Cosmological Constant, Λ, has been a controversial element in theoretical physics and cosmology since its introduction by Einstein in his field equations in 1917. Despite maintaining an irregular reputation over ...
[eng] This thesis aims to study nonlocal Lagrangians with a finite and an infinite number of degrees of freedom. We obtain an extension of Noether's theorem and Noether's identities for such Lagrangians. We then set up a ...
[eng] Despite the successes of the cosmological ΛCDM model and having entered the "Precision Era of Cosmology" there are still open questions. The principal model ingredients, ΛCDM, contribute to ~95% of the total energy ...
For many decades after the conception of the quark model in 1964, and the development of quantum chromodynamics (QCD) a few years later as the theory governing the strong interaction between quarks and gluons, there was ...
The existence of black holes that go beyond the mass given by their stellar origin has been known for some time. On the lower end, a subset of primordial black holes (PBHs) could form all of the dark matter with individually ...
Quantum algorithms showing promising speedups with respect to their classical counterparts already exist. However, noise limits the quantum circuit depth, making the practical implementation of many such quantum algorithms ...
Star formation is a fundamental and still largely unsolved problem of astrophysics and cosmology. Its complexity stems from the complex interaction of turbulence, magnetic fields and gravity, and from the onset of different ...
The standard cosmological model, ΛCDM, with the addition of an early inflationary phase, provides an accurate description of a nearly flat and homogeneous Universe, at large scales, which expands at an accelerated ...
Some binary systems consisting of a compact object, which can be either a neutron star or a black hole, and typically a non-degenerate companion star, have been shown to emit broadband radiation from radio up to gamma-ray ...
Nuclei make up the majority of the visible matter in the Universe; obtaining a first principles description of the nuclear properties and interactions between nuclei directly from the underlying theory of the strong ...
This thesis has been devoted to the study of the gravitational collapse of spherically symmetric perturbations on a Friedman-Robertson-Walker (FRW) universe filled by a perfect fluid. Large cosmological perturbations ...
AdS/CFT correspondence combines ideas of holography and duality in a way that allows one to make calculations in the otherwise hardly accessible (strongly coupled) regime of the target theory. In this thesis we are interested ...
En aquesta tesi s’estudien diferents models cosmològics, tots ells caracteritzats per considerar, de manera efectiva, una lleu evolució temporal de l’Energia Fosca, en contrast amb l’actual model estàndard de la cosmologia. ...
Open clusters are groups of stars, gravitationally bound together, that were born from the same molecular cloud and, thus, share similar positions, kinematics, ages and metallicities. Traditional methods to detect open ...
In this thesis, we are aimed to better understand the massive star formation process paying special attention to the role of the magnetic field. To do this, we will carry out a multi-scale analysis with a double approach, ...
