Analysis of some classical and quantum aspects of black holes 

    Gabbanelli, Luciano (Date of defense: 2019-11-04)

    For ninety years we have known that our universe is in expansion. Cosmological data favor an unknown form of intrinsic and fundamental uniform energy contributing approximately 68% of the total energy budget in the current ...

    Approaching nuclear interactions with lattice QCD 

    Illa Subiña, Marc (Date of defense: 2021-09-09)

    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 ...

    Chemical and dynamical analysis of Open Clusters in the context of the Milky Way disc 

    Casamiquela Floriach, Laia (Date of defense: 2017-06-23)

    This thesis has as a main purpose the determination of the chemical composition of Open Clusters for the study of the chemical gradients in the Galactic disc with: Galactocentric radius, position above the plane, and ...

    Collapse scenarios in magnetized star-forming regions 

    Juárez Rodríguez, Carmen (Date of defense: 2017-06-26)

    Turbulence, magnetic fields and gravity driven flows are important for the formation of new stars. Although magnetic fields have been proven to be important in the formation of stars, only a few works have been done ...

    Coupling fluid-dynamics and non-thermal processes to study sources of high-energy emission 

    Moreno de la Cita, Víctor (Date of defense: 2017-04-28)

    In this thesis we have developed a tool for the computation of non-thermal emission in astrophysical sources. The code reads the hydrodynamic data coming from relativistic hydrodynamic simulations and compute the injection, ...

    The cross-correlation among tracers of the underlying large-scale mass distribution in the universe 

    Pérez Ràfols, Ignasi (Date of defense: 2016-10-03)

    The work presented in this Ph.D. thesis is mostly related to the measurement and interpretation of the cross-correlation of different species. This is achieved using spectroscopic data from the BOSS survey of which I am a ...

    Dark energy in quantum field theory: Implications on modern cosmology 

    Moreno Pulido, Cristian (Date of defense: 2023-07-06)

    [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 ...

    Decay of Doubly Strange Hypernuclei 

    Maneu Victoria, Jordi (Date of defense: 2019-12-20)

    Double § hypernuclei are bound systems of several nucleons and two § hyperons. These systems are unstable with respect to the weak interaction and chiefly decay through two-body processes that conserve neither parity, ...

    Detection, characterisation and use of open clusters in a Galactic context in a Big Data environment 

    Castro Ginard, Alfred (Date of defense: 2021-04-30)

    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 ...

    The Dynamical State of Star-forming Regions, from Molecular Clouds to Massive Clumps 

    Lu, Zujia (Date of defense: 2022-04-26)

    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 ...

    Effective-theory description of heavy-flavored hadrons and their properties in a hot medium 

    Montaña Faiget, Glòria (Date of defense: 2022-07-08)

    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 ...

    Exotic phases of matter in low dimensional lattices: from quantum liquids to kinetic magnetism 

    Morera Navarro, Ivan (Date of defense: 2023-07-10)

    [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 ...

    Exploring Signatures of New Physics in Cosmology 

    Bellomo, Nicola (Date of defense: 2020-01-24)

    Cosmology is the study of the origin and evolution of our Universe as a whole. Even if the theoretical framework of Cosmology was developed a century ago, with the formulation of General Relativity by Albert Einstein, it ...

    Exploring the Universe with Quasar Absorption Spectra: correlations among tracers of the mass density field and the impact of ionizing background intensity fluctuations 

    Gontcho, Satya Gontcho A (Date of defense: 2017-09-22)

    The work we present in this manuscript revolves around the use of quasar spectra to probe the Universe. Absorption features in the electromagnetic spectrum of bright distant quasars by ionized hydrogen give us access to ...

    From the Precision Era towards the Accuracy Era of Cosmology with DESI 

    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 ...

    High Energy Processes in Active Galaxies 

    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 ...

    Holographic collisions and non-conformal dynamics 

    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 ...

    Holography applications in the strongly coupled sector: from QCD to the new physics 

    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 ...

    Implications of Dynamical Dark Energy in the expansion of the Universe and the Structure Formation 

    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. ...

    Interacting ultracold few-boson systems 

    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 ...