Departament de Física Quàntica i Astrofísica: Recent submissions
Now showing items 1-20 of 44
X-ray Signatures of Particle Escape from Pulsar Wind Nebulae
[eng] This PhD thesis aims at understanding the particle escape and subsequent emission processes taking place in Bow-shock Pulsar Wind Nebulae (BSPWNe), trying to connect a) the observational findings of large X-ray ...
La evolución química del disco de la Galaxia a partir de los cúmulos estelares
[spa] En esta tesis, estudiamos la evolución química del disco galáctico utilizando cúmulos abiertos como trazadores. Los cúmulos, formados por estrellas nacidas durante el mismo proceso de formación estelar, se mantienen ...
De-noising of gravitational-wave data: the rROF method in the cWB data analysis pipeline
[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 ...
Dynamical characterisation of the Magellanic Clouds with Gaia data and the KRATOS simulations
[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 ...
Towards a non-perturbative description of cosmological inflation
[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 ...
Disentangling the formation path of lenticular galaxies
[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 ...
Dark energy in quantum field theory: Implications on modern cosmology
[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 ...
Exotic phases of matter in low dimensional lattices: from quantum liquids to kinetic magnetism
[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 ...
Nonlocal Lagrangian Formalism
[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 ...
From the Precision Era towards the Accuracy Era of Cosmology with DESI
[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 ...
Effective-theory description of heavy-flavored hadrons and their properties in a hot medium
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 ...
Observational consequences of Black Holes in the Universe: From dark matter candidates to quasars
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 ...
Variational quantum architectures. Applications for noisy intermediate-scale quantum computers
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 ...
The Dynamical State of Star-forming Regions, from Molecular Clouds to Massive Clumps
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 ...
Primordial black holes and their implications for Inflation
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 ...
Modeling and observations of relativistic outflows in high-energy binary systems
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 ...
Approaching nuclear interactions with lattice QCD
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 ...
Numerical simulations of primordial black holes
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 ...
Holography applications in the strongly coupled sector: from QCD to the new physics
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
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. ...
