Ciencias con mención en Física

Permanent URI for this collectionhttp://98.81.228.127/handle/20.500.12404/15958

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search.filters.applied.f.advisor: search.filters.advisor.Bazo Alba, José Luis

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    A study of Ultra-High-Energy Cosmic Ray propagation in one-dimensional simulations
    (Pontificia Universidad Católica del Perú, 2021-02-15) Olivares Schneider, José Gabriel; Bazo Alba, José Luis
    Cosmic Rays have come to play an important role in understanding the universe, and astroparticle physics has undergone major developments in the last few decades. As such, several observatories have been set up with the purpose of detecting these particles, and simulation frameworks have been developed in order to further analyze their behavior by creating highly variable environments and parameters. This work covers the essential theory required to study propagation of Ultra- High-Energy Cosmic Rays restricted to linear one-dimensional propagation only; this includes the primary methods of energy loss during propagation, mainly through reactions with the photon background like photo-pion production and photo-disintegration, and additional cosmological effects. The study was done using the CRPropa 3.0 simulation framework. To determine the best possible maximum energy for the simulations, initial trials were done by testing the GZK cutoff for multiple energy values, followed by an analysis of heavier nuclei propagation. As a final complete test run, a model of the cosmic ray spectrum for energies above 1018 eV was made based on two data sets, one made from the average composition of the whole CR energy spectrum, and the other from The Pierre-Auger Observatory measurements for the high energy range. The results showed that initial source composition was the determining factor in the shape of the CR spectrum. These initial simulations done in this work will set the ground for future more complex simulations and studies.
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    Leptonic Modeling of the Multiwavelength Spectra of Astrophysical Sources
    (Pontificia Universidad Católica del Perú, 2021-02-10) Palomino Ylla, Ariadna Uxue; Bazo Alba, José Luis
    This work is motivated by the physical processes which take place in active galactic nuclei (AGN). They are powerful sources of radiation in a wide wavelength. To gain knowledge about these processes, multiwavelength spectral energy distributions (SED) are used. The current work uses three types of distributions applied to two blazars, a variety of AGN objects. The SED of blazars typically has a double-hump structure which can be explained in terms of two models: the hadronic and the leptonic model. A model built only by leptonic processes (in this case, inverse Compton and synchrotron) has proved to be fairly-good to explain the gamma-ray emission from most blazars. The Python package Naima restricts model parameters to find the best fit for the observed data and characterize the source by proposing processes that could take place there. The SEDs of the Mrk 421 and PKS 0537-441 blazars were modelled. The best fits obtained follows an electron differential distribution of the form of an exponential cutoff power law. They have a reduced c2 of 1.92 and 2.58, respectively. For the fitted model for the blazar PKS 0537-441, the radiation of the flux of photons product of the synchrotron process produces the major contribution on the inverse Compton flux.