3.16 Tesis doctorado

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Browsing 3.16 Tesis doctorado by Subject "Cosmología - Mediciones"

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    Computer simulations of modern cosmic microwave background experiments, and an application to the Cosmology Large Angular Scale Surveyor.
    (2019) Fluxá Rojas, Pedro Antonio; Dünner Planella, Rolando; Pontificia Universidad Católica de Chile. Instituto de Astrofísica
    The study of the Cosmic Microwave Background is one of the corner-stones in the understanding of our universe. In recent years, ground and space born telescope have evidence that the observable universe is well described by a relatively simple model, the ΛCDM model. Ongoing and future experiments aim at going even further than ΛCDM by probing the very first moments of our universe using CMB polarization. Within this polarization field lies a possible signature of inflation, the leading theory that explains why do we observe a flat, isotropic and homogeneous universe. This signal corresponds to primordial B-modes, and its faintness makes its detection a major technical challenge. In this work, we present computer simulations of the CLASS Q-band telescope, one of the four telescopes of the CLASS experiment aiming at characterizing, among other things, primordial B-modes and thus inflation. This work is divided in several chapters. The first two briefly introduce the reader to the general concepts of cosmology and the Cosmic Microwave Background (CMB). The third chapter describes the method used to model the polarizing properties of antennas. Chapter four presents the algorithm and prototype implementation of a new computer simulation code for CMB, which was used to build simulations of the CLASS experiment. Chapter five generally describes the CLASS telescope, and presents the methodology and results from electromagnetic simulations. This work finalizes by presenting the results of an application of the simulation code to CLASS using realistic parameters for its scanning strategy, beams and sky models.