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Testing the Standard cosmological model with model-independent parametrizations: some issues

Diego SŠez Gůmez
IA

Abstract
Over the last years, several model-independent methods in cosmology have been proposed as a tool for reconstructing theoretical models departing from observational data. This may be used to test the Standard cosmological model and its comparison with other theories. One such model-independent method is the so-called cosmographic approach, which relies only in the homogeneity and isotropy of the Universe on large scales. In this talk, I review some model-independent parametrizations of dark energy, and in particular I will focus on the many shortcomings within cosmographic approach, which provide biased results depending on the auxiliary variable used in the series expansion and is unable to rule out models or adequately reconstruct theories with higher-order derivatives in either the gravitational or matter sector.

2015 November 24, 10:30

IA/U.Lisboa
Faculdade de CiÍncias da Universidade de Lisboa (C6.2.51)
Campo Grande, 1749-016 Lisboa

Instituto de Astrof√≠sica e Ci√™ncias do Espa√ßo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia