Now showing items 21-38 of 38

    Leptonic CP Violation and its Origin 

    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 ...

    Meson-Baryon interactions from effective Chiral Lagrangians 

    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 ...

    Modeling and observations of relativistic outflows in high-energy binary systems 

    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 ...

    Multipartite entanglement and quantum algorithms 

    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 ...

    Neutron-rich matter in atomic nuclei and neutron stars 

    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 ...

    New insights into holography from supersymmetric localization 

    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 ...

    Nonlocal Lagrangian Formalism 

    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 ...

    Numerical Relativity studies in Anti-de Sitter spacetimes: Gravitational Collapse and the AdS/CFT correspondence 

    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 ...

    Numerical simulations of primordial black holes­­­­­­­­­­ 

    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 ...

    Observational and theoretical perspective of massive star formation 

    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, ...

    Observational consequences of Black Holes in the Universe: From dark matter candidates to quasars 

    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 ...

    Primordial black holes and their implications for Inflation 

    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 ...

    Studies of Black Hole Horizons 

    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 ...

    Study of b-hadron decays into two hadrons and a photon at LHCb and first observation of b-baryon radiative decays 

    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 ...

    Study of the extreme gamma-ray emission from Supernova Remnants and the Crab Pulsar 

    Galindo Fernández, Daniel (Date of defense: 2018-07-27)

    In our Galaxy, supernova remnants and pulsars are the two most numerous populations of non-thermal objects. The goal of this thesis is to study the extreme gamma-ray emission from these two astrophysical objects with Fermi ...

    Vacuum Energy in Quantum Field Theory and Cosmology 

    Gómez Valent, Adrià (Date of defense: 2017-09-12)

    The cosmological constant appearing in Einstein’s equations is a key element of the ΛCDM standard cosmological model. This term performs, effectively, as pure vacuum energy, and is considered the easiest explanation of the ...

    Variational quantum architectures. Applications for noisy intermediate-scale quantum computers 

    Bravo Prieto, Carlos (Date of defense: 2022-06-20)

    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 ...

    Wave propagation in metamaterials mimicking spacetime geometry: black holes and cosmic strings 

    Fernández Núñez, Isabel (Date of defense: 2018-07-19)

    In physics, it is common to find different phenomena being described by similar equations. A good analogy can make us look at a problem from a different point of view. In that way, ideas may be transferred from one field ...