Banca de QUALIFICAÇÃO: HENRIQUE DIAS GOMES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : HENRIQUE DIAS GOMES
DATA : 06/04/2022
HORA: 16:00
LOCAL: Online
TÍTULO:

Difusion of cosmic rays: a computational approach

PÁGINAS: 62
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Física
SUBÁREA: Física das Partículas Elementares e Campos
ESPECIALIDADE: Teorias Específicas e Modelos de Interação; Sistemática de Partículas; Raios Cósmicos
RESUMO:

The study of ultra-high energy cosmic rays (UHECRs) is within the astroparticle physics, a branch of research that lies between elementary particle physics and astrophysics. This area has had enormous growth in the last decades due, in part, to advances in experimental techniques and the construction of new experiments with large areas of exposure, which allowed the exploration of energy regions where the flux is very low, leading to the discovery of new structures in the ultra-high energy particle and gamma-ray energy spectrum. Such advances lead to the solution of important problems in cosmic ray physics. However, several questions remain open, such as the unequivocal identification of astrophysical sources, composition, and processes of production and acceleration of UHECRs.

There are indications of anisotropy at ultra-high energies that point to the possibility of identifying the sources. However, a detailed study of the propagation of particles in galactic and extragalactic magnetic fields is necessary since it is known that charged particles must deflect themselves under the action of the Lorentz force on their way to Earth.

This work uses the EGCRProp software as a starting point. This program has an advanced and complete simulation structure of ultra-high energy cosmic rays, and our main goal is to include a variety of processes of interactions between highly energetic particles and cosmic background radiation. Such processes are responsible for establishing deviations in the trajectory of these particles and, in particular, one of them is the reason for the effect known as the Greisen-Zatsepin-Kuzmin limit (GZK cutoff).

This thesis is divided into three stages: The first is the theoretical development and complete bibliographic survey of the phenomena of pair production, photopion production, and nuclear photodisintegration. The second step is the computational elaboration of these models and their consequent implementation in our software. The third step is to effectively simulate different scenarios in the developed program, and then compare it with the CRPropa code, a reference simulation in the area.

MEMBROS DA BANCA:
Presidente - Interno ao Programa - 1780373 - LAURA PAULUCCI MARINHO
Membro Titular - Examinador(a) Interno ao Programa - 1907614 - MAURICIO RICHARTZ
Membro Titular - Examinador(a) Interno ao Programa - 1676798 - CELSO CHIKAHIRO NISHI
Membro Suplente - Examinador(a) Interno ao Programa - 2616823 - ALYSSON FABIO FERRARI