Banca de QUALIFICAÇÃO: LAZARO LIMA DE SALES

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : LAZARO LIMA DE SALES
DATA : 26/01/2022
HORA: 14:00
LOCAL: UERN
TÍTULO:

Non-Gaussian Effects of Saha Ionization in Cosmology and Gravitation

PALAVRAS-CHAVES:

Equation of Saha; Tsallis's statistics; Rindler's space; primordial universe

PÁGINAS: 42
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Astronomia
SUBÁREA: Astrofísica Extragalactica
ESPECIALIDADE: Cosmologia
RESUMO:

Tsallis's non-Gaussian thermostatistics has received increasing attention due to its success in describing phenomena that manifest unusual thermodynamic properties. In this context, the non-Gaussian Saha equation must follow a generalized thermal equilibrium condition of matter and radiation. In this work, we intend to evaluate the non-Gaussian effects of Saha ionization in the domain of cosmology and gravitation. Specifically, we will emphasize the study of the primordial universe: cosmological recombination, Big Bang nucleosynthesis, and particle anti-particle excess. Furthermore, we will study the photoionization of hydrogen atoms and the production of electron-positron pairs, both in Rindler spacetime. As preliminary results, in cosmology, we highlight two important non-Gaussian effects: i) new conditions of chemical equilibrium, both for relativistic and non-relativistic regimes; and ii) new binding energy of the hydrogen atom. We also show that there is a q value other than 1 that gives the same result as the usual case for the nucleosynthesis temperature and the equilibrium fractional ionization temperature. In gravitation, we show that the non-Gaussian Saha equation in Rindler spacetime provides binding energy with a quadratic dependence of the gravitational field, whereas the usual result is a linear dependence. Therefore, the photoionization of hydrogen atoms and the production of pairs are both more intensely suppressed in regions with a strong gravitational field. Besides, we derive constraints on the gravitational field and the chemical potentials of the electron and positron.

MEMBROS DA BANCA:
Presidente - 8032 - EDESIO MIGUEL BARBOZA JUNIOR
Interno - 721.063.104-63 - RAIMUNDO SILVA JÚNIOR - UFRN
Externo à Instituição - ARMANDO BARTOLOME BERNUI LEO - ON/MCT