The effect of non-gaussian primordial perturbations on large-scale structure

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dc.contributor.advisorCandlish, Graeme
dc.contributor.authorPeña Pinto, Greco
dc.date.accessioned2023-12-06T14:17:26Z
dc.date.available2023-12-06T14:17:26Z
dc.date.issued2021-12
dc.description.abstractThe late-time effect of primordial non-Gaussianity offers a window into the physics of inflation and the very early Universe. In this thesis we study the conse- quences of a particular class of primordial non-Gaussianity that is fully characterized by initial density fluctuations drawn from a non-Gaussian probability density func- tion, rather than by construction of a particular form for the primordial bispectrum. We numerically generate multiple realisations of cosmological structure and use the late-time matter power spectrum, bispectrum and trispectrum to determine the ef- fect of these modified initial conditions. We show that the initial non-Gaussianity has only a small imprint on the first three polyspectra, when compared to a stan- dard Gaussian cosmology. Furthermore, some of our models present an interesting scale-dependent deviation from the Gaussian case in the bispectrum and trispectrum, although the signal is at most at the percent level. The majority of our models are consistent with CMB constraints, while the others are only marginally excluded. Finally, we discuss further possible extensions of our study.en_ES
dc.facultadFacultad de Cienciasen_ES
dc.identifier.citationPeña, G. (2021). The effect of non-gaussian primordial perturbations on large-scale structure (Tesis de postgrado). Universidad de Valparaíso, Valparaíso, Chile.en_ES
dc.identifier.urihttps://repositoriobibliotecas.uv.cl/handle/uvscl/13449
dc.language.isoenen_ES
dc.publisherUniversidad de Valparaísoen_ES
dc.subjectDISTRIBUCION DE GAUSSen_ES
dc.subjectANALISIS DE FOURIERen_ES
dc.subjectPERTURBACION (ASTRONOMIA)en_ES
dc.titleThe effect of non-gaussian primordial perturbations on large-scale structureen_ES
dc.typeTesisen_ES
uv.catalogadorPJR CIENen_ES
uv.departamentoInstituto de Fisica y Astronomiaen_ES
uv.notageneralMagíster en Astrofísicaen_ES

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Tesis postgrado Astrofísica