Vitenti, Mariana Penna LimaAlabora, Alexandre de Ramos2026-09-042026-09-042026-03-12https://repositorio.uel.br/handle/123456789/19911Precise modeling of dark matter halo density profiles is increasingly important for mass calibration in modern cosmological surveys, where uncertainties in halo structure propagate into weak-lensing and cluster-based constraints on cosmology. This thesis reviews theΛCDM framework, structure formation, and the role of halos in lensing analyses, and then compares several parametric halo density models within two widely used computational libraries: NUMCOSMO and COLOSSUS. Using halos with a set of representative masses,Mvir ∈{5×1013, 1014, 5×1014, 1015} M⊙, at redshifts commonly explored in cosmological surveys, z ∈ {0.6, 0.9, 1.2}, we evaluate dark matter inner profiles (NFW, Hernquist, and Einasto), composite outer-profile extensions, and the DK14 model. The inner profiles show excellent agreement, with relative differences at the 10-9 to 10-8 level. The Einasto profile combined with constant-density and power-law outer terms also shows similarly high consistency, with discrepancies remaining at the 10-9 level once the normalization procedures are matched. The DK14 comparison yields agreement at the 10-7 level, indicating robust consistency even for a more structurally complex profile. In contrast, the Einasto + 2-halo comparison remains well behaved Only over part of the radial range and develops significant discrepancies at large radii, showing that this case still requires further investigation. Overall, the results validate the NumCosmo implementations for the inner, mean-density, power-law, and DK14 profiles, while identifying the 2-halo treatment as the main remaining source of unresolved numerical mismatcengDark matter (Astronomy)HaloWeak lensingGalaxies clustersCosmological parametersDissertaçãoCiências Exatas e da Terra - FísicaCiências Exatas e da Terra - FísicaMatéria escura (Astronomia)HaloLenteamento fracoGaláxias AglomeradosParâmetros cosmológicos