Observational constraints in Delta Gravity : CMB and supernovas

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dc.contributor.advisorAlfaro Solís, Jorge Luis
dc.contributor.authorSan Martín Hormazábal, Marco
dc.contributor.otherPontificia Universidad Católica de Chile. Facultad de Física
dc.date.accessioned2021-01-07T14:25:41Z
dc.date.available2021-01-07T14:25:41Z
dc.date.issued2020
dc.date.updated2021-01-05T22:54:36Z
dc.descriptionTesis (Ph.D. in Astrophysics)--Pontificia Universidad Católica de Chile, 2020
dc.description.abstractI study the cosmological implications of Delta Gravity (DG), which is a gravitational model based on the extension of General Relativity (GR) by a new symmetry called δ ̃. In this model, new matter fields are added to the original matter fields, motivated by the additional symmetry. We call them δ ̃ matter fields. This theory predicts an accelerating Universe without introducing a Cosmological Constant Λ by hand in the equations. To test the Delta Gravity implications, I examine two critical observations in Cosmology: the rate of the Universe expansion through type Ia supernovae (SNe-Ia) and the power spectrum calculated from the cosmic microwave background radiation (CMB). To compare the observations with these model's predictions, I used a Markov Chain Monte Carlo (MCMC) analysis with the most updated SNe-Ia and Planck satellite data catalog. I obtain the fitted parameters needed to explain both SNe-Ia data and CMB measurements. I analyze the DG model's compatibility with both observations and constrain the cosmological parameters associated with the astrophysical evidence. Finally, I discuss if the Hubble Constant and the Accelerating Universe are compatible with the DG context's observational evidence.
dc.format.extentxi, 178 páginas
dc.identifier.doi10.7764/tesisUC/FIS/50175
dc.identifier.urihttps://doi.org/10.7764/tesisUC/FIS/50175
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/50175
dc.language.isoen
dc.nota.accesoContenido completo
dc.rightsacceso abierto
dc.subject.otherRadiación cósmica de fondo - Modelos matemáticoses_ES
dc.subject.otherRelatividad generalizada (Física)es_ES
dc.subject.otherAstrofísica - Modelos matemáticoses_ES
dc.titleObservational constraints in Delta Gravity : CMB and supernovases_ES
dc.typetesis doctoral
sipa.codpersvinculados49962
sipa.codpersvinculados213497
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