Finalized Master theses

Número de entradas: 40

Strong decay of the Psi(3770) in dense matter

Estado: defended (14/11/2013)
Estudiante: Victor Lopez de Rioja
Supervisada por: Laura Tolos ; Ramos, A.
Universidad: Universitat de Barcelona

The decay of Psi(3770) in D Dbar is analyzed in connection with the future FAIR project at GSI
Estado: defended (14/11/2013)
Estudiante: Victor Lopez de Rioja
Supervisada por: Laura Tolos ; Ramos, A.
Universidad: Universitat de Barcelona

The decay of Psi(3770) in D Dbar is analyzed in connection with the future FAIR project at GSI

Motion around Black Holes in a Pseudo-Newtonian Framework

Estado: defended (18/09/2013)
Estudiante: José Maraver Lerdo de Tejada
Supervisada por: Carlos Sopuerta
Universidad: Universitat Autònoma de Barcelona

La motivación de este trabajo surge de la necesidad de describir sistemas de muchas partículas alrededor de agujeros negros o de sistemas con distribuciones de materia complejos alrededor de agujeros negros. Un  ejemplo de mucha relevancia astrofísica son discos de acreción, los cuales aparecen…
Estado: defended (18/09/2013)
Estudiante: José Maraver Lerdo de Tejada
Supervisada por: Carlos Sopuerta
Universidad: Universitat Autònoma de Barcelona

La motivación de este trabajo surge de la necesidad de describir sistemas de muchas partículas alrededor de agujeros negros o de sistemas con distribuciones de materia complejos alrededor de agujeros negros. Un  ejemplo de mucha relevancia astrofísica son discos de acreción, los cuales aparecen en agujeros negros tanto estelares como supermasivos.  La integración de las ecuaciones del movimiento relativistas es computacionalmente muy intensiva y puede requerir recursos enormes de centros de supercomputacion.  Para aliviar estas necesidades de computación se han utilizado potenciales newtonianos modificados motivados por las ecuaciones relativistas (pseudo-potenciales newtonianos).

Reflectance properties of asteroids and meteorites: Testing Gaia’s spectral capabilities for asteroid taxonomic classification purposes

Estado: defended (15/09/2013)
Estudiante: Jordi Cortés Comellas
Supervisada por: Josep M. Trigo-Rodríguez ; Xavier Luri (UB)
Universidad: Universitat de Barcelona

The intrinsic difficulty of performing remote asteroid characterization has brought scientists to study the reflectance properties of meteorites. Thereby, join studies of meteorite composition and petrology, physical properties and dynamical evolution of asteroids, have been strengthened links between…
Estado: defended (15/09/2013)
Estudiante: Jordi Cortés Comellas
Supervisada por: Josep M. Trigo-Rodríguez ; Xavier Luri (UB)
Universidad: Universitat de Barcelona

The intrinsic difficulty of performing remote asteroid characterization has brought scientists to study the reflectance properties of meteorites. Thereby, join studies of meteorite composition and petrology, physical properties and dynamical evolution of asteroids, have been strengthened links between specific meteorite and asteroid taxonomic classes. Nowadays, the remote characterization of asteroids is made by using reflectance spectroscopy. Reflectance spectroscopy is able to identify a high variety of features associated with minerals that compose the surface of these bodies. In general, except for few undifferentiated bodies that escaped thermal and aqueous alteration processes, most of the rock-forming minerals of asteroids have suffered some degree of thermal and aqueous alteration associated with metamorphism. The most of altered bodies suffered important bulk chemistry changes along the Solar system formation that together with space gardening of divers materials, increased the diversity and complexity of the body surfaces. Aqueous alteration and thermal metamorphism are the mainly processes that promoted mineralogical changes. This work has compiled part of our current knowledge on the reflectance properties of S class asteroids and ordinary chondrites in order to infer GAIA capabilities to detect this asteroid class.

Critical phenomena in gravitational collapse. Study in asymptotically Minkowski and Anti-de Sitter space-times

Estado: defended (12/09/2013)
Estudiante: Daniel Santos Oliván
Supervisada por: Carlos Sopuerta
Universidad: Universitat de Barcelona

We are going to use numerical relativity to focus in the problem of gravitational collapse of a scalar field. The rest chapter of this thesis is dedicated to the classical Choptuik's problem of gravitational collapse in asymptotically flat spacetime. In the second chapter, we try to address a more…
Estado: defended (12/09/2013)
Estudiante: Daniel Santos Oliván
Supervisada por: Carlos Sopuerta
Universidad: Universitat de Barcelona

We are going to use numerical relativity to focus in the problem of gravitational collapse of a scalar field. The rest chapter of this thesis is dedicated to the classical Choptuik's problem of gravitational collapse in asymptotically flat spacetime. In the second chapter, we try to address a more contemporary problem as the gravitational collapse in asymptotically Anti-de Sitter spacetime.

Development of the Detector Tray for the Wide Field Monitor of the Large Observatory For x-ray Timing (LOFT), a medium-class candidate mission in ESA´s Cosmic Vision 2015-2025

Estado: defended (15/07/2013)
Estudiante: Dmitri Karelin
Supervisada por: Margarita Hernanz
Universidad: Universitat Politècnica de Catalunya

LOFT, the Large Observatory For X-ray Timing, has recently pass the ESA call as one of the four M3 mission candidates that will compete for a launch opportunity at the start of the 2020s. The primary goal of the mission is to study strong-field gravity, black hole masses and spins, and the…
Estado: defended (15/07/2013)
Estudiante: Dmitri Karelin
Supervisada por: Margarita Hernanz
Universidad: Universitat Politècnica de Catalunya

LOFT, the Large Observatory For X-ray Timing, has recently pass the ESA call as one of the four M3 mission candidates that will compete for a launch opportunity at the start of the 2020s. The primary goal of the mission is to study strong-field gravity, black hole masses and spins, and the equation of state of ultra-dense matter via high-time-resolution Xray observations of compact objects. Two instruments will be comprised in the scientific payload of LOFT: the Large Area Detector (LAD) a 12 m2 collimated X-ray detector in the 2-80 keV range, with unprecedented timing capabilities, and the Wide Field Monitor (WFM), a coded-mask wide field X-ray monitor. Both instruments are based on silicon drift detectors. The main scope of WFM is catch good triggering sources to be pointed with LAD. LOFT’s Wide Field Monitor (WFM) will discover and localize X-ray transients and impulsive events and monitor spectral state changes with unprecedented sensitivity, providing interesting targets for LAD's pointed observations. The working principle of the WFM is the classical sky encoding by coded masks and is widely used in space borne instruments (e.g. INTEGRAL, RXTE/ASM, Swift/BAT). The mask shadow recorded by the position-sensitive detector can be de-convolved by using the proper procedures to recover the image of the sky, with an angular resolution given by the ratio between the mask element size and the mask-detector distance. By using Silicon Drift Detectors (SDDs), with a position resolution

The dynamic behavior and modeling of meteors using the Runge-Kutta algorithm

Estado: defended (11/07/2013)
Estudiante: Joan Dergham
Supervisada por: Josep M. Trigo-Rodríguez
Universidad: Universitat Autònoma de Barcelona

The goal of this master thesis is developing a model to describe the behavior of the meteors during atmospheric deceleration. The process is studied in the framework of the mass drag-loss equations or so-called single body theory which was first described by Brohnsten (1983). The drag-loss equations…
Estado: defended (11/07/2013)
Estudiante: Joan Dergham
Supervisada por: Josep M. Trigo-Rodríguez
Universidad: Universitat Autònoma de Barcelona

The goal of this master thesis is developing a model to describe the behavior of the meteors during atmospheric deceleration. The process is studied in the framework of the mass drag-loss equations or so-called single body theory which was first described by Brohnsten (1983). The drag-loss equations are introduced in a differential form, and depend on parameters like the shape, the density, the initial mass, the ablation coefficient and others. By fitting the curve created by the differential equations to the observational data obtained from multiple-station camera recordings, all these parameters can be obtained. Then, we expect to achieve a better understanding of the meteoroid interaction and the formation of meteors. Basically we will study how the meteoroid decelerates and penetrates into the atmosphere. In particular we will study the entry and ablation model of Chelyabinsk  asteroid.

Implications for compact stars of a nuclear equation-of-state constrained from heavy ion collisions

Estado: defended (02/07/2012)
Estudiante: Eduard Bosch Coch
Supervisada por: Laura Tolos
Universidad: Universitat de Barcelona

Measurements of kaon production at subthreshold energies in heavy-ion collisions point to a soft nuclear equation of state for densities up to two to three times nuclear matter saturation density. We apply these results to study the implications on compact star properties, especially in the context…
Estado: defended (02/07/2012)
Estudiante: Eduard Bosch Coch
Supervisada por: Laura Tolos
Universidad: Universitat de Barcelona

Measurements of kaon production at subthreshold energies in heavy-ion collisions point to a soft nuclear
equation of state for densities up to two to three times nuclear matter saturation density. We apply these results
to study the implications on compact star properties, especially in the context of the recent measurement of
the two solar mass pulsar PSR J1614-2230. The implications are twofold: First, the heavy-ion results constrain
nuclear matter at densities relevant to light neutron stars. Hence, a radius measurement could provide information
about the density dependence of the symmetry energy which is a crucial quantity in nuclear physics. Second,
the information on the nucleon potential obtained from the analysis of the heavy-ion data can be combined with
restrictions from causality on the nuclear equation of state. From this we can derive a limit for the highest allowed
compact star mass of three solar masses.

An analytical Model of Accretion onto White Dwarfs

Estado: defended (20/06/2012)
Estudiante: Nataly Ospina Escobar
Supervisada por: Margarita Hernanz
Universidad: Universitat Autònoma de Barcelona

Accretion in white dwarf systems can occur through discs, accretion columns or directly onto the magnetic poles, depending of the magnetic field of the white dwarf. A white dwarf accretes matter from a companion star (typically a red dwarf) that fills its Roche lobe. This matter forms an accretion…
Estado: defended (20/06/2012)
Estudiante: Nataly Ospina Escobar
Supervisada por: Margarita Hernanz
Universidad: Universitat Autònoma de Barcelona

Accretion in white dwarf systems can occur through discs, accretion columns or directly onto the magnetic poles, depending of the magnetic field of the white dwarf. A white dwarf accretes matter from a companion star (typically a red dwarf) that fills its Roche lobe. This matter forms an accretion disc inside the Roche lobe of the WD. The disc, however, is disrupted by the WD magnetic field at some distance from the WD surface. As a result the accreting matter freely falls on to the WD surface and forms a strong shock near its surface. The post-shock matter has a high temperature and emits X-rays. The temperature of the post-shock matter depends on the WD mass and, therefore, the X-ray spectra can be used for WD mass determination. The purpose of this work is study the structure of the emission region (temperature, density and gas velocity distributions) and to calculate the X-ray spectrum of the thermal bremsstrahlung from this region.

Studying Martian meteorites: looking for clues on Mars

Estado: defended (13/06/2012)
Estudiante: Carles Eduard Moyano Cambero
Supervisada por: Josep M. Trigo-Rodríguez
Universidad: Universitat Autònoma de Barcelona

Some achondrites, differentiated meteorites, were suggested to be originated in Mars, but reasonable doubt persisted for decades. Fortunately in 1983 Bogard and Johnson noticed that the meteorite Elephant Moraine 79001 contained very small amounts of trapped gases within shock glass veins in the same…
Estado: defended (13/06/2012)
Estudiante: Carles Eduard Moyano Cambero
Supervisada por: Josep M. Trigo-Rodríguez
Universidad: Universitat Autònoma de Barcelona

Some achondrites, differentiated meteorites, were suggested to be originated in Mars, but reasonable doubt persisted for decades. Fortunately in 1983 Bogard and Johnson noticed that the meteorite Elephant Moraine 79001 contained very small amounts of trapped gases within shock glass veins in the same proportion that they were measured by the Viking spacecraft in Mars’ atmosphere. Consequently, the scientific community realized that meteoritics, the branch of astronomy and cosmochemistry that studies meteorites, was completely necessary to increase our knowledge of the planet. Martian meteorites are an available source of samples from the red planet to be studied in terrestrial laboratory; in fact, they are the only samples available by now. Consequently, the main goals of this master work are:
1. To explain the main analytical techniques capable to identify Martian meteorites in terrestrial laboratories. This includes applying some of them to which we have direct access.
2. Martian meteorites are strongly affected by shock as they are delivered to Earth after colossal impacts with asteroids that impulse surface rocks with enough kinetic energy to escape of Mars’ gravity field. Understanding the impact effects on their constitutive minerals, and knowing the minerals typically produced by shock is necessary to obtain right conclusions on the real Mars mineralogy.
3. To describe the main clues obtained on Mars atmospheric evolution by using the data already obtained on the basis of the implanted gas in SNC meteorite glasses.    

Bulk viscosities of color-flavor quark matter

Estado: defended (31/03/2011)
Estudiante: Robert Bierkandt
Supervisada por: Cristina Manuel Hidalgo

We evaluate the three bulk viscosity coefficients $\zeta_1, \zeta_2$ and $\zeta_3$ in the color-flavor locked (CFL) superfluid phase due to phonons and kaons, which are the lightest modes in that system. We first show that the computation is rather analogous to the computation of the same coefficients…
Estado: defended (31/03/2011)
Estudiante: Robert Bierkandt
Supervisada por: Cristina Manuel Hidalgo

We evaluate the three bulk viscosity coefficients $\zeta_1, \zeta_2$ and $\zeta_3$ in the color-flavor locked (CFL) superfluid phase due to phonons and kaons, which are the lightest modes in that system. We first show that the computation is rather analogous to the computation of the same coefficients in superfluid $^4$He, as due to phonons and rotons. For astrophysical applications, we also find the value of the viscosities when there is a periodic disturbance, and the viscosities also depend on the frequency of the disturbance. In a temperature regime that might be of astrophysical relevance, we find that the contributions of both the phonons and kaons should be considered, and that $\zeta_2$ is much less that the same coefficient in unpaired quark matter.
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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