Exploring teleparallel dark energy

• Ano de defesa: 2014
• Autor(a) principal: Otalora Patiño, Giovanni [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Gravitação; Energia escura (Astronomia)
• Link de acesso: http://hdl.handle.net/11449/108894

In the present thesis we study the cosmological dynamics of the dark energy component of the Universe in the context of the Teleparallel Equivalentof General Relativity, also known as Teleparallel Gravity. It has been proposed recently the existence of a nonminimal coupling between a scalar ?eld (quintessence or tachyon) and gravity in the framework of Teleparallel Gravity, motivated by similar constructions in the context of General Relativity. By generalizing and studying the dynamics of these models, we ?nd interesting and viable cosmological solutions. Then we propose a new model in which the four-derivative of the scalar ?eld of dark energy is non-minimally coupled to vector torsion. This kind of coupling is grounded on the fact that in Teleparallel Gravity a scalar ?eld as a particle of spin zero couples to torsion through its four-derivative, which is a vector ?eld. Differently from the old teleparallel dark energy scenario, this new model is conceptually consistent with the precepts of Teleparallel Gravity, and has no equivalent in the General Relativity context