Finalized Master theses

Nombre d'entrades: 51

On the relation between dark matter in halos and stellar mass in the Euclid Flagship galaxy mock

Estat: defended (28/11/2019)
Estudiant: Gonzalez Reina, J.
Supervisat per: Pablo Fosalba Vela
Universitat: Universidad Internacional de Valencia

In this work the verification of Euclid Consortium Flagship mock galaxy catalogue based on 2 trillion Dark Matter particles cosmological simulation performed on Piz Daint Supercomputer at Swiss National Supercomputing Center has been carried out by comparison with results from SDSS and COSMOS thorough…
Estat: defended (28/11/2019)
Estudiant: Gonzalez Reina, J.
Supervisat per: Pablo Fosalba Vela
Universitat: Universidad Internacional de Valencia

In this work the verification of Euclid Consortium Flagship mock galaxy catalogue based on 2 trillion Dark Matter particles cosmological simulation performed on Piz Daint Supercomputer at Swiss National Supercomputing Center has been carried out by comparison with results from SDSS and COSMOS thorough the works that proposed analytic fitting functions in the near and far Universe, even though the work concentrates efforts in the calibration in near universe.

Hot Neutron Rich Nuclear Matter Studied with the BCPM NuclearEnergy Density Functional

Estat: defended (20/09/2019)
Estudiant: Clara Dehman
Supervisat per: Xavier Viñas; Mario Centelles; Artur Polls
Universitat: Universitat de Barcelona

The main purpose of the master thesis was to study the thermal properties of a recently formulated nuclear energy density functional. The functional has been successfully used to describe finite nuclei and cold neutron stars. This functional is known as BCPM (Barcelona-Catania-Paris-Madrid) and it is…
Estat: defended (20/09/2019)
Estudiant: Clara Dehman
Supervisat per: Xavier Viñas; Mario Centelles; Artur Polls
Universitat: Universitat de Barcelona

The main purpose of the master thesis was to study the thermal properties of a recently formulated nuclear energy density functional. The functional has been successfully used to describe finite nuclei and cold neutron stars. This functional is known as BCPM (Barcelona-Catania-Paris-Madrid) and it is based on microscopic calculations using the realistic Argonne v_{18} potential plus three-body forces of Urbana type. In the first part of the thesis, the main focus is on the thermodynamical properties of symmetric nuclear matter at zero and finite temperature using the BCPM functional. This study is next generalized to the case of asymmetric nuclear matter, where the thermodynamic properties will be investigated at zero and finite temperature. Later on, we investigate the properties of uniform β-stable matter, for the neutrino-free scenario at zero and finite temperature, and for the neutrino-trapped scenario at a fixed temperature and entropy. The β-stable matter is a key ingredient to perform different astrophysical applications of the BCPM functional, namely, the mass-radius relation and the tidal deformability for proto-neutron stars and for hot neutron stars.

Probing cosmology and gravity theories through topological statistical descriptors

Estat: defended (12/09/2019)
Estudiant: Carballosa, A.
Supervisat per: Pablo Fosalba Vela
Universitat: Universitat Autònoma de Barcelona

The morphological features of a given field such as the dark matter density field in the large scale structure of the Universe can be quantified through a set of statistical descriptors known as the Minkowski Functionals (MF). These descriptors contain information on all the N-point correlation functions,…
Estat: defended (12/09/2019)
Estudiant: Carballosa, A.
Supervisat per: Pablo Fosalba Vela
Universitat: Universitat Autònoma de Barcelona

The morphological features of a given field such as the dark matter density field in the large scale structure of the Universe can be quantified through a set of statistical descriptors known as the Minkowski Functionals (MF). These descriptors contain information on all the N-point correlation functions, which turns them into a powerful tool to probe departures from Gaussianity and a strong complement to other statistical observables in the task of improving the constrains in the parameters of different cosmological models. In this work, we investigate to which point the Minkowski Functionals can be used to differentiate between two theories of gravity, General Relativity and Modified Gravity, through the analysis of pixelated all-sky maps generated from large N-body lightcone simulations

Constraining modified gravity models through the turnaround radius

Estat: defended (06/09/2019)
Estudiant: Cesar Ramirez Perez
Supervisat per: Sergei D Odintsov ; Emilio Elizalde
Universitat: Universitat de Barcelona

work
Estat: defended (06/09/2019)
Estudiant: Cesar Ramirez Perez
Supervisat per: Sergei D Odintsov ; Emilio Elizalde
Universitat: Universitat de Barcelona

work

Effective field theory methods for chiral plasmas

Estat: defended (06/09/2019)
Estudiant: Marc Comandran Casas
Supervisat per: Cristina Manuel Hidalgo
Universitat: Universitat Autònoma de Barcelona

The physics of extremely hot and/or dense relativistic plasmas is extremely rich. Quantum field theory computations for these systems have revealed to be cumbersome, as the standard quantum loop expansion valid at zero temperature ceases in this case to correspond to a gauge coupling constant expansion. In these plasmas there is a well-defined hierarchy of energy scales, defined by the temperature and/or chemical potential, as well as derived energy scales, obtained by multiplying the above by the gauge coupling constant. This fact gives the basic playground to use effective field theory techniques. In this thesis we will use and develop effective field theory techniques for the study of hot and/or dense plasma, and show how one can compute many properties of theses plasmas at high accuracy. Applications of these methods for both astrophysical and cosmological settings will be addressed.
The physics of extremely hot and/or dense relativistic plasmas is extremely rich. Quantum field theory computations for these systems have revealed to be cumbersome, as the standard quantum loop expansion valid at zero temperature ceases in this case to correspond to a gauge coupling constant expansion.…
Estat: defended (06/09/2019)
Estudiant: Marc Comandran Casas
Supervisat per: Cristina Manuel Hidalgo
Universitat: Universitat Autònoma de Barcelona

The physics of extremely hot and/or dense relativistic plasmas is extremely rich. Quantum field theory computations for these systems have revealed to be cumbersome, as the standard quantum loop expansion valid at zero temperature ceases in this case to correspond to a gauge coupling constant expansion. In these plasmas there is a well-defined hierarchy of energy scales, defined by the temperature and/or chemical potential, as well as derived energy scales, obtained by multiplying the above by the gauge coupling constant. This fact gives the basic playground to use effective field theory techniques. In this thesis we will use and develop effective field theory techniques for the study of hot and/or dense plasma, and show how one can compute many properties of theses plasmas at high accuracy. We will mainly focus in plasmas where there is a chiral fermion imblance, and compute the photon polarization tensor, and check that we can describe the chiral magnetic effect.

Bounce cosmology from F(R,T) modified gravity

Estat: defended (06/09/2019)
Estudiant: Gerard Navo Perez
Supervisat per: Emilio Elizalde ; Sergei D Odintsov
Universitat: Universitat de Barcelona

work
Estat: defended (06/09/2019)
Estudiant: Gerard Navo Perez
Supervisat per: Emilio Elizalde ; Sergei D Odintsov
Universitat: Universitat de Barcelona

work

Design of an antenna for the detection of kHz electromagnetic disturbances on-board LISA

Estat: defended (12/07/2019)
Estudiant: Ho, J.J
Supervisat per: Miquel Nofrarias Serra; J. Ramos-Castro
Universitat: Universitat Politècnica de Catalunya

The Laser Interferometer Space Antenna (LISA) is a mission led by the European Space Agency that seeks to be the first space-based observatory capable to detect and measure gravitational waves. Since it is a pioneer investigation, some of the required technologies have been never proved before in a space…
Estat: defended (12/07/2019)
Estudiant: Ho, J.J
Supervisat per: Miquel Nofrarias Serra; J. Ramos-Castro
Universitat: Universitat Politècnica de Catalunya

The Laser Interferometer Space Antenna (LISA) is a mission led by the European Space Agency that seeks to be the first space-based observatory capable to detect and measure gravitational waves. Since it is a pioneer investigation, some of the required technologies have been never proved before in a space environment, but just on-ground, arising then the need of launching a technology demonstrator for the mission, the LISA Pathfinder (LPF). The scope was to prove that the technology was able to detect differential acceleration noises between two test masses in nominal free-fall up to 30 fm·s-2/√Hz. After two years of testing, the spacecraft provided the data of the performances of each of the units contributing to the payload, the so-called LISA Technology Package (LTP). The results confirmed that the experiment was successful – even better than expected – because LPF detected differential acceleration noises below the requirements. Nonetheless, several glitches of unknown sources were found throughout the overall noise spectrum and had to be removed from the data in order to provide the results. Otherwise, the peaks add an excess noise in the low frequencies. Since this effect is not negligible, many hypotheses have been proposed and discarded until the present day to try to explain the physical phenomena. One of them is related to the magnetic contribution, and asserts that the origin is given by the down-conversion of a high frequency (kHz) amplitude modulating magnetic field into the LISA measureable bandwidth, located in the low frequency region (mHz). These time varying signals will be detected with audio-range sensors. Hence, the objective of this work is to design the most feasible sensor capable to detect the offending signals, considering the LISA requirements, the distribution of the units onboard the spacecraft, the modulation of the respective magnetic fields, or the sensor design specifications. The results prove that a simple air-cored search coil can be used as the demanded sensor, achieving sensitivities below the required and, therefore, capable to detect amplitude modulating magnetic fields of different intensities and distances from the test masses. 

Study of S-bearing molecules in high-mass star-forming regions

Estat: defended (11/07/2019)
Estudiant: Santiago Ubach Ramirez
Supervisat per: Gemma Busquet ; Josep Miquel Girart Medina
Universitat: Universitat Autònoma de Barcelona


Sulfur-bearing molecules have been detected in different interstellar environments, from diffuse clousd to star-forming regions.  Observations show that the total sulfur conent in dense cores is depleted by several orders of magnitude in comparison with diffuse clouds. 
In this master thesis we analyze IRAM 30m data toward three high-mass star-forming regions to investigate the content of sulfur-bearing species during the earliest stages of massive and star cluster formation. 
Sulfur-bearing molecules have been detected in different interstellar environments, from diffuse clousd to star-forming regions.  Observations show that the total sulfur conent in dense cores is depleted by several orders of magnitude in comparison with diffuse clouds.  In this master thesis we analyze…
Estat: defended (11/07/2019)
Estudiant: Santiago Ubach Ramirez
Supervisat per: Gemma Busquet ; Josep Miquel Girart Medina
Universitat: Universitat Autònoma de Barcelona

Sulfur-bearing molecules have been detected in different interstellar environments, from diffuse clousd to star-forming regions.  Observations show that the total sulfur conent in dense cores is depleted by several orders of magnitude in comparison with diffuse clouds. 
In this master thesis we analyze IRAM 30m data toward three high-mass star-forming regions to investigate the content of sulfur-bearing species during the earliest stages of massive and star cluster formation. 

A search for Brown Dwarfs in the Taurus star-forming region

Estat: defended (08/10/2018)
Estudiant: Manuel Perger
Supervisat per: Martín, E.

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Estat: defended (08/10/2018)
Estudiant: Manuel Perger
Supervisat per: Martín, E.

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Testing Weak Lensing magnification bias in the Euclid Flagship galaxy mock

Estat: defended (13/09/2018)
Estudiant: Cristian Nery Viglione Munoz
Supervisat per: Pablo Fosalba Vela; Blot, L.
Universitat: Universitat Autònoma de Barcelona

One of the major goals of observational cosmology is to map the large-scale structure of the universe. Traditionally this is performed using large surveys of galaxies. But these surveys only map the light distribution while most of the matter in the Universe appears to be dark. This is where gravitational…
Estat: defended (13/09/2018)
Estudiant: Cristian Nery Viglione Munoz
Supervisat per: Pablo Fosalba Vela; Blot, L.
Universitat: Universitat Autònoma de Barcelona

One of the major goals of observational cosmology is to map the large-scale structure of the universe. Traditionally this is performed using large surveys of galaxies. But these surveys only map the light distribution while most of the matter in the Universe appears to be dark. This is where gravitational lensing becomes a useful phenomenon to study the distribution of all the matter as the light's path is aected by the gravity of any kind of matter. The progress in the development of simulated catalogs has allowed the implementation of weak lensing observables. We can study and test predictions in order to understand these observables and prepare for the analysis of the information of future observational surveys. In this thesis we analyze and validate several lensing observables like the convergence and the detection angle coming from data of the simulated Flagship galaxy mock, the rst ocial pertaining to ESA's Euclid mission. Our main focus resides in the study and validation of the two competing eects of the magnication bias that change the number density counts of galaxy sources. We follow the methodology presented in the MICE Gran Challenge paper but using data of the Flagship simulation, a catalog with 10 times more galaxies than MICE-GC, extracted from the Cosmohub web portal. We also re-obtain the desired plots for MICE-GC to check our procedure and carry out comparisons. We couldn't capture, and therefore validate, the survey area distortion term, related to the lensed positions, of the magnications bias. So we discuss possibles causes to this issue in relation to resolution and systematic eects of Flagship's data.
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An institute of the Consejo Superior de Investigaciones Científicas

An institute of the Consejo Superior de Investigaciones Científicas
Affiliated with the Institut d'Estudis Espacials de Catalunya

Affiliated with the Institut d'Estudis Espacials de Catalunya