Accelerated expansion as manifestation of gravity: when dark energy belongs to the left

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dc.contributor.advisor-co1Amendola, Luca
dc.contributor.advisor1Piattella, Oliver Fabio
dc.contributor.advisor1IDhttps://orcid.org/0000000345580574
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/5707156831919279
dc.contributor.authorGiani, Leonardo
dc.contributor.referee1Fabris, Julio Cesar
dc.contributor.referee1IDhttps://orcid.org/000000018880107X
dc.contributor.referee1Latteshttp://lattes.cnpq.br/5193649615872035
dc.contributor.referee2Velten, Hermano Endlich Schneider
dc.contributor.referee2IDhttps://orcid.org/0000000251557998
dc.contributor.referee2Latteshttp://lattes.cnpq.br/0282590467459210
dc.contributor.referee3Silva, Saulo Carneiro de Souza
dc.contributor.referee3IDhttps://orcid.org/000000017098383X
dc.contributor.referee3Latteshttp://lattes.cnpq.br/5571527465158124
dc.contributor.referee4Iglesias, Jorge Antonio Zanelli
dc.contributor.referee5Kamenchtchik, Alexandre
dc.date.accessioned2024-05-30T00:48:52Z
dc.date.available2024-05-30T00:48:52Z
dc.date.issued2020-10-23
dc.description.abstractIn order to explain the Late-times accelerated expansion of the Universe we must appeal to some form of Dark Energy. In the standard model of cosmology, the latter is interpreted as a Cosmological Constant . However, for a number of reasons, a Cosmological Constant is not completely satisfactory. In this thesis we study Dark Energy models of geometrical nature, and thus a manifestation of the underlying gravitational theory. In the rst part of the thesis we will review the CDM model and give a brief classi cation of the landscape of alternative Dark Energy candidates based on the Love lock theorem. The second part of the thesis is instead devoted to the presentation of our main results on the topic of Dark Energy. To begin with, we will report our studies about nonlocal modi cations of gravity involving the differential operator 1R, with emphasis on a speci c model and on the common behavior shared by this and similar theories in the late stages of the evolution of the Universe. Then we introduce a novel class of modi ed gravity theories based on the anticurvature tensor A (the inverse of the Ricci tensor), and assess their capability as source of Dark Energy. Finally, we will discuss a type of drift e ects which we predicted in the contest of Strong Gravitational Lensing, which could be employed both to study the e ective equation of state of the Universe and to constrain violations of the Equivalence Principle.
dc.description.sponsorshipFundação Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.formatText
dc.identifier.urihttp://repositorio.ufes.br/handle/10/13987
dc.languagepor
dc.publisherUniversidade Federal do Espírito Santo
dc.publisher.countryBR
dc.publisher.courseDoutorado em Astrofísica, Cosmologia e Gravitação
dc.publisher.departmentCentro de Ciências Exatas
dc.publisher.initialsUFES
dc.publisher.programPrograma de Pós-Graduação em Astrofísica, Cosmologia e Gravitação
dc.rightsopen access
dc.subjectTeorema de Lovelock
dc.subjectEnergia escura
dc.subjectModelo VAAS
dc.subject.br-rjbnsubject.br-rjbn
dc.subject.cnpqAstronomia
dc.titleAccelerated expansion as manifestation of gravity: when dark energy belongs to the left
dc.typedoctoralThesis
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