Now showing items 19-38 of 43
Brieden, Samuel (Date of defense: 2022-09-14)
[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 ...
Torres i Albà, Núria (Date of defense: 2019-10-14)
This thesis has as an objective the study of very energetic phenomena in the central regions of active galaxies. Intense star formation is triggered by mergers of galaxies, and the funneling of large quantities of gas ...
Triana Iglesias, Miquel (Date of defense: 2017-09-21)
The gauge/gravity duality has proven to be a very useful tool in the understanding of quantum field theories outside the perturbative regime. In particular, holography has been able to shed light not only on generic ...
Katanaeva, Alisa (Date of defense: 2021-02-10)
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 ...
de Cruz Pérez, Javier (Date of defense: 2021-04-16)
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. ...
Mujal Torreblanca, Pere (Date of defense: 2019-11-22)
In this thesis, we study the physical properties of several ultracold few-boson systems depending on the interactions between their constituents. Nowadays, experimentally, it is possible to have great control with high ...
Esteban Muñoz, Iván (Date of defense: 2020-09-10)
At the end of the 20th century, experiments studying neutrinos coming from the Sun and cosmic rays hitting the atmosphere revealed that these particles can change their flavour, behaving in a way that the Standard Model ...
Feijoo Aliau, Albert (Date of defense: 2017-09-21)
The purpose of this thesis has been to study the S=-1 meson-baryon interaction in S-wave employing an effective chiral SU(3) lagrangian up to NLO and implementing unitarization in coupled channels. Such a study requires ...
Molina Lumbreras, Edgar (Date of defense: 2021-09-29)
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 ...
Alsina Leal, Daniel (Date of defense: 2017-09-18)
Quantum information science has grown from being a very small subfield in the 70s until being one of the most dynamic fields in physics, both in fundamentals and applications. In the theoretical section, perhaps the feature ...
González Boquera, Claudia (Date of defense: 2020-01-13)
The proper understanding of the equation of state (EoS) of highly asymmetric nuclear matter is essential when studying systems such as neutron stars (NSs). Using zero-range Skyrme interactions and finite-range interactions ...
Torrents Verdaguer, Genís (Date of defense: 2016-06-27)
Maldacena's conjecture, often known as the holographic duality or the AdS/CFT correspondence, proposes an equivalence between gravitational theories in a hyperbolic space of a certain dimensionality and gauge theories ...
Heredia Pimienta, Carlos (Date of defense: 2023-03-31)
[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 ...
Santos-Oliván, Daniel (Date of defense: 2017-07-12)
In this thesis we study several open problems using Numerical Relativity on asymptotically Anti-de Sitter (AdS) spacetimes. The understanding of the dynamics of AdS is interesting not only because of pure theoretical reasons ...
Escrivá Mañas, Alberto (Date of defense: 2021-06-21)
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 ...
Añez López, José Ignacio (Date of defense: 2021-05-05)
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, ...
Oncins Fernández, Marc (Date of defense: 2022-06-03)
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 ...
Triantafyllou, Nikolaos (Date of defense: 2021-11-12)
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 ...
Martínez Montero, Marina (Date of defense: 2016-10-14)
This thesis has focused entirely on classical and thermodynamical aspects of black hole physics. We have developed four different projects involving different kinds of black holes. 1 BLACK BRANES IN A BOX Neutral black ...
Rives Molina, Vicente José (Date of defense: 2016-11-17)
This thesis is divided in different sections. After a short introduction about the thesis contents, the theory chapter presents the Standard Model of Particle Physics (SM), with an emphasis on those properties of flavour ...