DISSERTAÇÃO DE MESTRADO #776 – LUCAS MARTINS BARRETO ALVES – 21/08/2025

Gravitational Waves from the Big Bang

Autor: Lucas Martins Barreto Alves

Banca Examinadora

Prof. Gláuber Carvalho Dorsch (orientador)

Física - UFMG

Prof. Lucas Lages Wardil

Física - UFMG

Prof. Nelson de Oliveira Yokomizo

Física - UFMG

Prof. Bruce Lehmann Sánchez (suplente)

Física - UFMG

Orientação

Prof. Gláuber Carvalho Dorsch

DF/UFMG

Resumo do Trabalho

For millennia, humanity has relied exclusively on light-initially visible light and, later, broader and broader portions of the electromagnetic spectrum—to observe the universe. In the past decade, a remarkable chapter in extending astronomy beyond electromagnetic antennas has been concretized: the dawn of gravitational-wave astronomy has opened a new observational window into the cosmos. Among the many new astronomical sources we may now look for and study through their gravitational-wave signals, the Big Bang is surely among the most fascinating. Gravitational waves give us concrete hope of directly observing the primordial universe, whose light, emitted more than 13.7 billion years ago, is blocked from reaching our telescopes. This dissertation is aimed at the study of gravitational waves from cosmic inflation, the main scientific paradigm for the very early universe. Therefore, the text is divided into chapters on gravitational waves, inflationary cosmology, and inflationary gravitational waves. More specifically, our discussion will be steered by the endeavor to explain how the gravitational-wave signal sought by the NANOGrav observatory could have originated in the primordial universe.