Inflação quintessencial quente

• Autor(a) principal: Almeida, Renato Silva de
• Data de Publicação: 2023
• Outros Autores: [e-mail]
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/20683
• topic: Inflationary universe; Dark energy (Astronomy); Cosmology; Warm inflation; Quintessential models; Universo inflacionário; Energia escura (Astronomia); Cosmologia; Inflação quente; Modelos de quintessência; CIENCIAS EXATAS E DA TERRA::ASTRONOMIA::ASTROFISICA EXTRAGALACTICA::COSMOLOGIA

We study in this dissertation the possible unification of the regimes of inflation in the primordial universe and the accelerated expansion (dark energy) regimes in the later universe by means of dissipative effects. In particular, we seek to analyze how such dissipative effects are able to produce a consistent dynamics unifying these two epochs of the universe. The topics covered aim to seek a general understanding of the dynamical nature of interactin fields and applications in cosmology, i.e., in the case of models involving a quintessence field. By doing so, we aim to describe quintessential inflation in the context of warm inflation and characterized by different types of interactions between fields and their consistency from the point of view of dynamical systems. Furthermore, we propose interaction terms between the quintessence field and matter in a manner equivalent to the interaction terms found in warm inflation, where the inflaton interacts with radiation. By proposing the set of background equations together with parameterized dissipative terms in a specific way, the dissipation term was radiation-related dominating during the inflationary period, thus leading to a warm inflation regime, while the matter-related dissipation term dominating at late times. It was also possible to obtain the results related to the evolution of the dissipation terms Qr, Qm,1 and Qm,2 together with the evolution equations. For the dynamics related to late times, we took into account the (x, y) plane. In the (x, y) plane it was possible to have information about the behavior of the trajectories that pass through the accelerated region, which is important to study the late dynamics of the system, where it is possible to know the capacity of the system to reach a regime dominated by DE. Another analysis made in this dissertation was the stability of the slow-roll conditions. The analysis of the dynamical system took place in different regimes, in order to study the stability of the system in them.