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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...