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  • AGRIPINO SEGUNDO DE SOUSA NETO, AGRIPINO SEGUNDO DE SOUSA NETO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2026-04-29)
    Modern cosmology provides a consistent description of the Universe on large scales, although fundamental questions, such as the nature of dark energy and the consistency among different cosmological estimates, remain open. ...
  • BARBOSA DA FONSECA TEIXEIRA, DINORAH (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-10-31)
    The fact that Einstein’s equations connect the space-time geometry to the total dark content of the cosmic substratum, but not to individual contributions of its constituents, can be translated into a degeneracy in the ...
  • COUTINHO DE CARVALHO, GABRIELA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2015-09-11)
    The distribution of galaxies, provided by large astronomical surveys, makes possible detailed studies of the nature of the primordial density fluctuations and the process of structure formation in the universe. Among the ...
  • DA SILVA AVILA, FELIPE (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2018-02-27)
    The standard model of cosmology is based on the Cosmological Principle (CP), which states that, on large scales, the Universe is homogeneous and isotropic. It predicts that the transition from an inhomogenous to a homogeous ...
  • da Silva Guerini, Thais (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-04-07)
    In 1970 the cosmologist Allan Sandage described Cosmology as ” the search for two numbers”, referring to the Hubble parameter H0 and the deceleration parameter q0 [1]. Cosmography is a useful tool to test models and estimate ...
  • DA SILVA RODRIGUES, GABRIEL (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-08-05)
    Testing the variability of fundamental constants in Nature consists in one of the strongest tests of fundamental Physics. Any significant evolution of these values would immediately hint at new physics, and demand a profound ...
  • DOS SANTOS ANDRADE, UENDERT (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2018-02-27)
    The standard cosmology strongly relies upon the Cosmological Principle, which consists on the hypotheses of large scale isotropy and homogeneity of the Universe. Testing these assumptions is, therefore, crucial to determining ...
  • ELLEN COSTA DE ALMEIDA, ELLEN COSTA DE ALMEIDA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2026-08-26)
    The well-established planet-metallicity correlation indicates that planets form through the core accretion mechanism, but the influence of other elements besides Fe in this process is still unknown. Thus, expanding stellar ...
  • FARAJ DE SOUZA, RAYFF ABY (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2023-08-10)
    In this work, we explore aspects of a Non-Minimal Higgs Inflation model, where radiative corrections are included in the Coleman-Weinberg approximation. By means of a MCMC analysis, we constrain the parameter that quantifies ...
  • Fernanda Araujo de Oliveira, Fernanda Araujo de Oliveira (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2026-08-21)
    In this study, we perform tests aiming to investigate the viability of alternative theories to the Standard Cosmological Model by using two important tools: Gaussian Processes and Markov Chain Monte Carlo. Using data ...
  • Gabriel da Silva Rodrigues, Gabriel da Silva Rodrigues (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2026-05-04)
    Neutrinos play a fundamental role in both particle physics and cosmology, providing an important bridge between the physics of the very small and the largest scales of the Universe. While neutrino oscillation experiments ...
  • GOMES LOPES, MARIA EDUARDA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-08-16)
    The bulk flow motion in the Local Universe is a collective phenomenon arising from the peculiar motions of matter structures, which, instead of moving randomly, appear to exhibit an approximately dipolar velocity flow. For ...
  • JAIANE DA SILVA SANTOS, JAIANE DA SILVA SANTOS (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2026-02-20)
    The fundamental constants of Nature play a crucial role in our understanding of the Universe. They represent the limits of our knowledge of the laws of physics, but at the same time, they systematize new phenomena yet ...
  • Jonathan Silva de Morais, Jonathan Silva de Morais (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2026-07-31)
    In this work, we investigate the potential of gravitational-wave standard sirens to constrain cosmographic parameters independently of a specific cosmological model. We consider simulated catalogs of \textit{bright sirens}, ...
  • LEAL DIAS, BRUNO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-02-20)
    We investigate the transition scale to homogeneity, RH , using as cosmic tracer the spectroscopic sample of blue galaxies from the Sloan Digital Sky Survey (SDSS). Considering the spatial distribution of the galaxy sample, ...
  • LEMOS PORCIUNCULA ALVES, THAIS (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-10-25)
    Fast radio bursts (FRBs) are a new class of high-energy transient events with short duration within the radio frequency range from a few hundred to a few thousand MHz. Although the physical mechanism responsible for these ...
  • LOPES DA SILVA DIAS, MARIANA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-08-15)
    This work aims to conduct a consistency test of the Cosmological Principle, one of the fundamental hypotheses of the Standard Cosmological Model. This principle postulates that the Universe is homogeneous and isotropic on ...
  • Manoel Vicente de Souza Filho, Manoel Vicente de Souza Filho (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2026-01-29)
    The growth of cosmic structures is investigated through the analyses of f(z) and σ8(z) cosmic observables data, using non-parametric Gaussian Process reconstructions combined with MCMC statistical analyses. The standard ...
  • Maria Vitoria Lazarin, Maria Vitoria Lazarin (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2026-07-24)
    Baryon Acoustic Oscillations (BAO), a preferred scale of approximately 150 Mpc im- printed on the large-scale matter distribution by acoustic waves in the primordial plasma, constitute one of the most robust standard ...
  • MASSON VICENTE, ALEXANDRE (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2020-07-07)
    This work aims to obtain a non-parametric reconstruction of the temperature evolution law of the cosmic microwave background by the application of Gaussian Processes and to set constraints on cosmologies that violate the ...