Finalized Master theses

Número de entradas: 37

The Lambdac(2940)+ as a molecular D*N (Ds*Lambda) state

Estado: defended (25/07/2017)
Estudiante: Montaña, G.
Supervisada por: Laura Tolos ; Ramos, A.
Universidad: Universitat de Barcelona

Upon the assumption of being a resonance with spin-parity J=3/2-, the Lambda_c(2940)+ is described in this thesis as a vector meson-baryon molecule. Also, a visible signal of this resonance is found in the invariant mass spectrum of the Lambda_b -> pi D0 p decay. This is achieved after a complete…
Estado: defended (25/07/2017)
Estudiante: Montaña, G.
Supervisada por: Laura Tolos ; Ramos, A.
Universidad: Universitat de Barcelona

Upon the assumption of being a resonance with spin-parity J=3/2-, the Lambda_c(2940)+ is described
in this thesis as a vector meson-baryon molecule. Also, a visible signal of this resonance
is found in the invariant mass spectrum of the Lambda_b -> pi D0 p decay. This is achieved after a
complete study of the interaction of pseudoscalar mesons and vector mesons with baryons in
the charm C = 1 sector within a coupled-channel approach in SU(4), using the hidden gauge
formalism to implement the interaction through a vector meson exchange model. The results of
the model presented here predict the Lambdac(2940)+ as a state with basically rho Sigma_c and K*Xi'c components,
but also coupling to the D*N and D*sLambda channels. It is the coupling to these latter
vector meson-baryon systems which allows the appearance of a peak in the D0p invariant mass
distribution of the b decay, signalling the presence of the Lambdac(2940)+. The study of the details
of the weak decay and the hadronization process leads to a clear signal of this resonance, as well
as other interesting features, which make the Lambda_b -> pi D0 p decay an interesting process to be
observed experimentally, both for validating the molecular nature of the Lambdac(2940)+ and for the
observation of new exotic hadron states.

Inflation from fluid models

Estado: defended (15/02/2017)
Estudiante: Kerim Demirel
Supervisada por: Sergei D Odintsov ; Emilio Elizalde
Universidad: Universitat Autònoma de Barcelona

Fluid inflation is proposed and studied.
Estado: defended (15/02/2017)
Estudiante: Kerim Demirel
Supervisada por: Sergei D Odintsov ; Emilio Elizalde
Universidad: Universitat Autònoma de Barcelona

Fluid inflation is proposed and studied.

The J/Psi interaction with nucleons and baryons within a unitarized SU(6)x HQSS meson-baryon model

Estado: defended (24/10/2016)
Estudiante: Elisabet Galiana Baldo
Supervisada por: Laura Tolos
Universidad: Universitat de Barcelona

We present a detailed analysis of the hidden charm sector (i.e. with cc pairs), with C = 0. In particular, we study the interaction between J/Y and nucleons and baryons. For this purpose, we use a theoretical model that has been built in previous works, that is based on a suitable extension of the…
Estado: defended (24/10/2016)
Estudiante: Elisabet Galiana Baldo
Supervisada por: Laura Tolos
Universidad: Universitat de Barcelona

We present a detailed analysis of the hidden charm sector (i.e. with cc pairs),
with C = 0. In particular, we study the interaction between J/Y and nucleons and
baryons. For this purpose, we use a theoretical model that has been built in previous
works, that is based on a suitable extension of the Weinberg Tomozawa term
to include, beside Chiral Symmetry, Spin Flavour Symmetry in the light sector and
Heavy Quark Spin Symmetry in the heavy sector. Within this model we obtain the
interaction between J=1/2+, J=3/2+ baryons and pseudoscalar and vector mesons which
contain light and heavy quarks. We carry out the calculation of some scattering observables,
such as cross sections and scattering lengths, while comparing the results
with other works. Moreover, we analyze the existence of the two new states recently
discovered by the LHCb Collaboration, the P+c (4380) and P+c (4450) pentaquarks.
We find that we can only reproduce one of the state, the Pc(4450) pentaquark, if we
modify considerably the subtraction point.

Correlations between Cosmic Voids and CMB Lensing in the MICE Simulation

Estado: defended (14/09/2016)
Estudiante: Umut Emek Demirbozan
Supervisada por: Pablo Fosalba Vela; Kovacs, A.

In this Master Thesis we investigate the correlation between Cosmic Microwave Background(CMB) lensing with cosmic voids in the large scale structure in the universe by using MICE-Grand Challenge(GC) simulation. We use the convergence map generated from MICE-Grand Challange simula- tion to search…
Estado: defended (14/09/2016)
Estudiante: Umut Emek Demirbozan
Supervisada por: Pablo Fosalba Vela; Kovacs, A.

In this Master Thesis we investigate the correlation between Cosmic Microwave Background(CMB) lensing with cosmic voids in the large scale structure in the universe by using MICE-Grand Challenge(GC) simulation. We use the convergence map generated from MICE-Grand Challange simula- tion to search for correlation between CMB lensing convergence with cosmic voids. We identify the voids in MICE-GC simulation by using the void finder algorithm in Sanchez et al. (2016) and use different samples of input galaxies from MICE-GC and measure CMB lensing effect in these samples. One recent study Cai et al. (2016) found a significant correlation between Planck convergence data and BOSS-CMASS voids and we were developing our work in parallel to this study. In our study, we find ≈ 3σ correlation by using similar input sample (0.4<z<0.7) as in Cai et al. (2016). Furthermore, we found that the voids which are deeper (very underdense) signifi- cantly more likely to have CMB lensing imprint. However, these underdense voids are generally smaller. Since there are much more smaller voids than large voids, it follows that small voids are more likely to have imprint on the CMB lensing map. Our findings are consistent with the results by Cai et al. (2016). In addition to this, we show that there is a special region on cen- tral underdensity vs general underdensity plane where voids are very likely to have imprint on the CMB lensing map. We measure radial convergence profile as a function void radius and discuss the potential usage of this technique to derive cosmological parameters. 

GAMMA RAY EMISSION STUDY OF PSR J2022+3842 WITH FERMILAT

Estado: defended (14/09/2016)
Estudiante: Mariona Caixach
Supervisada por: Emma de Ona Wilhelmi
Universidad: Universitat Autònoma de Barcelona

This project presents the analysis of the pulsar PSR J2022+3842 which has been previously identified as one of the most energetic pulsars in radio and X-rays. Here we analyse the source 3FGL J2022.2+3840 identifying it with the pulsar. The analysis has been taken from data observed by the LAT,…
Estado: defended (14/09/2016)
Estudiante: Mariona Caixach
Supervisada por: Emma de Ona Wilhelmi
Universidad: Universitat Autònoma de Barcelona

This project presents the analysis of the pulsar PSR J2022+3842 which has been previously identified as one of the most energetic pulsars in radio and X-rays. Here we analyse the source 3FGL J2022.2+3840 identifying it with the pulsar. The analysis has been taken from data observed by the LAT, on board of the NASA satellite Fermi Gamma-ray Space Telescope, in order to study its gamma radiation from 60 MeV to 50GeV. Previously, in order to make the project more understandable, some theoretical aspects about very high energy radiation and pulsars are explained. 

Analyzing the photometric performance of the PAU survey

Estado: defended (14/09/2016)
Estudiante: Andrea Pocino Yuste
Supervisada por: Francisco Javier Castander Serentill
Universidad: Universitat Autònoma de Barcelona

Using the Bayesian Photometric Redshift, a template-fitting based code, we compute the expected photometric accuracy for the Physics of the Accelerating Universe (PAU) sur- vey through simulations. We check its real performance by computing the photometric redshift using observed data through PAUCam…
Estado: defended (14/09/2016)
Estudiante: Andrea Pocino Yuste
Supervisada por: Francisco Javier Castander Serentill
Universidad: Universitat Autònoma de Barcelona

Using the Bayesian Photometric Redshift, a template-fitting based code, we compute the expected photometric accuracy for the Physics of the Accelerating Universe (PAU) sur- vey through simulations. We check its real performance by computing the photometric redshift using observed data through PAUCam from a period of observations during the first semester of 2016. Then we validate the photo-z by comparing it to the highly reliable photometric and spectroscopic redshift from COSMOS survey. At the end we obtain a photometric accuracy of σ ∼ 0.0019(1 + z) for real data of PAU.

Clues on protoplanetary disk components from the meteorite evidence

Estado: defended (07/09/2016)
Estudiante: Tanbakouei, S.
Supervisada por: Josep M. Trigo-Rodríguez
Universidad: Universitat Autònoma de Barcelona

Complementary to observations of protoplanetary disks, the remnant solid bodies of our planetary system provide valuable clues on the conditions of the solar system during its formation as well on planet formation, which could be applicable to study other systems as well. Undifferentiated bodies preserved…
Estado: defended (07/09/2016)
Estudiante: Tanbakouei, S.
Supervisada por: Josep M. Trigo-Rodríguez
Universidad: Universitat Autònoma de Barcelona

Complementary to observations of protoplanetary disks, the remnant solid bodies
of our planetary system provide valuable clues on the conditions of the solar system
during its formation as well on planet formation, which could be applicable to
study other systems as well. Undifferentiated bodies preserved their internal structure,
because they were the ones that did not melt or were not involved in large-scale
differentiation processes. From time-to-time meteorites fall on Earth and preserve
clues on these early processes. Contrarily of what is commonly believed, they are
only affected by atmospheric entry in a thin outer layer known as fusion crust. Their
interior below that outer layer is preserved, and if the meteorite was not largely affected
by impact metamorphism in the parent body, the study of its basic chemistry
and mineralogy with modern equipment allow to unveil the first accretionary processes
occurred in our solar system. Meteorites, especially chondriticmeteorites, are
therefore, a way to provide observational constraints on the physical scenarios regarding
primary accretion: having formed within the first few million years after the
origin of the solar system, in a disk that was still gas-reach, they are real fossils of the
protoplanetary disk-forming materials. The dominant components of these chondrites
are chondrules: ~100 micrometers to mm-sized stony spherules composed primarily of
the silicate minerals olivine and pyroxene. Here a short introduction
to the origin of chondrules, and the implications for the composition of chondrites
will be given to demonstrate the importance that meteorite studies have to validate
astrophysicalmodels and observations of protoplanetary disks.

Simulación y ánalisis del experimento de la ventana óptica en la misión LISA Pathnder

Estado: defended (21/09/2015)
Estudiante: Francisco Rivas García
Supervisada por: Carlos Sopuerta ; Miquel Nofrarias Serra
Universidad: Universidad de Granada
Url: https://www.ugr.es

En este trabajo se va a dar una visión general sobre ondas gravitacionales (fundamentos matemáticos, detectores, etc) que introducirá qué es y el por qué de la misión espacial LISA Pathnder (LPF), poniendo especial atención en uno de los experimentos que llevará a cabo una vez en su órbita,…
Estado: defended (21/09/2015)
Estudiante: Francisco Rivas García
Supervisada por: Carlos Sopuerta ; Miquel Nofrarias Serra
Universidad: Universidad de Granada
Url: https://www.ugr.es

En este trabajo se va a dar una visión general sobre ondas gravitacionales (fundamentos matemáticos, detectores, etc) que introducirá qué es y el por qué de la misión espacial LISA Pathnder (LPF), poniendo especial atención en uno de los experimentos que llevará a cabo una vez en su órbita, el experimento de la Optical Window (OW).

Modeling and Analysis of the Galaxy Clustering

Estado: defended (18/09/2015)
Estudiante: Anna Maria Porredon Díez de Tejada
Supervisada por: Martin Crocce ; Pablo Fosalba Vela
Universidad: Universitat Autònoma de Barcelona

Splitting the different calculations of a pipeline into interchangeable modular units seems to be a promising method for analyzing samples of data in a large scientific collaboration. Here, we develop a stable code that models the two-point correlation function of galaxies, as this observable is…
Estado: defended (18/09/2015)
Estudiante: Anna Maria Porredon Díez de Tejada
Supervisada por: Martin Crocce ; Pablo Fosalba Vela
Universidad: Universitat Autònoma de Barcelona

Splitting the different calculations of a pipeline into interchangeable modular units seems to be a promising method for analyzing samples of data in a large scientific collaboration. Here, we develop a stable code that models the two-point correlation function of galaxies, as this observable is a powerful tool to derive cosmological constraints. Then, we simulate mock data from this model assuming that the data points are uncorrelated and follow a Poisson distribution centered at the theoretical values. Last, from the expected theoretical values and the mock data, we take a modular approach to perform a Markov Chain Monte-Carlo (MCMC) likelihood analysis on some cosmological parameters. The resulting values of these parameters are in agreement with the true ones used to generate the mock data, thus we conclude that the pipeline is consistent. 

BOUND GEODESIC ORBITS IN KERR SPACETIME

Estado: defended (16/09/2015)
Estudiante: Massimiliano Baravelli
Supervisada por: Carlos Sopuerta
Universidad: Universitat Autònoma de Barcelona

This work is based on the derivation of the analytical solution of the bound timelike geodesic orbits of a particle in Kerr spacetime done by Ryuichi Fujita and Wataru Hikida [1]. I wrote a code to compute these solutions expressed in terms of elliptic integrals using Mino time as the independent variable.…
Estado: defended (16/09/2015)
Estudiante: Massimiliano Baravelli
Supervisada por: Carlos Sopuerta
Universidad: Universitat Autònoma de Barcelona

This work is based on the derivation of the analytical solution of the bound timelike geodesic orbits of a particle in Kerr spacetime done by Ryuichi Fujita and Wataru Hikida [1]. I wrote a code to compute these solutions expressed in terms of elliptic integrals using Mino time as the independent variable. These papers are structured as follows: in the introduction is explained the importance of the study of the geodesic motion to investigate the properties of a Kerr black hole; in the first section there are the details of the theory used in this work, the Kerr spacetime, the Mino time and the bound geodesic orbits; in section two I talk about the project itself, how the code has been done and the main procedure, also the results and plots are showed with a comparison with previous works; finally, in section three, there are the main conclusions and how and where this kind of project could be applied.
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