Observational tests of the fundamental hypothesis of Cosmology

 

 

 

 

 

The standard model of Cosmology (SCM) consists on the LCDM model, which is dominated by cold dark matter and Cosmological Constant. Although this model provides the best description of cosmological observation thus far, the nature of these two components remain unveiled. Therefore, there is an urge to develop models to explain them, but on top of that, we need to put the fundamental hypotheses underlying the SCM under scrutiny. After all, statistically significant evidence of departure of these hypotheses may lead to complete reformulation of the SCM. In this talk, I present some observational tests I carried out with this goal. I will talk about some observational tests of the Cosmological Principle - namely, the assumption of large-scale homogeneity and isotropy of the Universe - using a variety of cosmological data. In addition, I will show results obtained by probing the validity of two fundamental assumptions which these data relies upon: the constancy of the absolute magnitude of Type Ia Supernovae, and the current temperature of the CMB.