Inflação estocástica não-isentrópica

• Autor(a) principal: Silva, Leandro Alexandre da
• Data de Publicação: 2013
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/12848
• topic: Stochastic inflation; Nonisentropic inflation; Warm inflation; Stochastic dynamics; Inflação estocástica; Inflação não-isentrópica; Dinâmica estocástica; CNPQ::CIENCIAS EXATAS E DA TERRA::ASTRONOMIA::ASTROFISICA EXTRAGALACTICA::COSMOLOGIA

In nonisentropic inflationary models, the contribution to the power spectrum is essentially derived from thermal fluctuations. This is the opposite situation than the cold inflation, where the quantum fluctuations provide the total contribution to the spectrum.Little or no importance has been given to the intermediate case, where quantum and thermal contributions are comparable. In this work, relying on nonisentropic inflation and Starobinsky's stochastic inflation program, we propose a general framework that aims to describe explicitly and in a transparent way both quantum and thermal contributions to the inflaton power spectrum. The result for the power spectrum reproduces, when we take appropriate limits, the standard expressions of cold and nonisentropic inflation. In order to check model consistence and its viability, we made use of typical single field polynomial-type inflaton potential. Despite this kind of potential be strongly disfavored by observations in the cold inflation context, we surprisingly found that dissipative and temperature effects are able to restore their compatibility with cosmological parameters inferred from 9-year WMAP data. Farther, by inserting such effects on the large scale dynamics of inflaton field, we extend some results related to the eternal inflation scenario.