Banca de DEFESA: ANDREIA DOS SANTOS SIMOES

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : ANDREIA DOS SANTOS SIMOES
DATA : 20/07/2021
HORA: 14:30
LOCAL: Plataforma da conferência WEB RNP
TÍTULO:

Relativistic Electron and Positron Scattering by Atoms Using Thermal Field Dynamics

PALAVRAS-CHAVES:

Temperature, Thermal Field Dynamics, Scattering, Differential Shock Section.

PÁGINAS: 151
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Física
RESUMO:

In this work, we use the Fock space structure to apply thermal field dynamics (TFD - Thermofield Dynamics) in relativistic scattering theory. We start from Dirac's equation as describing a field of relativistic matter; the Fock space structure was applied to the original system and its dual; the Bogoliubov transformation is used to determine the scattering matrix at finite temperature. With this formulation we determine expressions for the differential cross sections (DCS – Differential Cross Section) of the relativistic electron and p ositron scattering processes by atoms at finite temperature, and we perform calculations using these expressions. For the correction of the electrostatic potential we use an analytical shielding function based on the superposition of Yukawa-type potentials. We obtained that the influence of temperature is presented as a correction to the description at zero temperature. This correction has a value of one for temperature equal to zero and tends to a constant value (0.0625) when the temperature tends to infinity; in this limit, the thermal DCS is 16 times smaller than the DCS at zero temperature, a result compatible with data obtained by other authors in the analysis of other systems.

MEMBROS DA BANCA:
Externo à Instituição - GERALDO MAGELA E SILVA
Externo à Instituição - MARCOS ANTÔNIO DE CASTRO
Externo à Instituição - ADEMIR EUGENIO DE SANTANA - UnB
Interno - 664720 - ANTONIO FERREIRA DA SILVA
Presidente - 102.263.461-53 - JOSE DAVID MANGUEIRA VIANA - UFBA