The cosmic microwave background (CMB) is a snapshot of the Universe at early times (z ∼ 1100). In the recent years, several experiments have provided constraints on the concordance ΛCDM model from a statistical analysis of the CMB anisotropies. On the other hand, many galaxy surveys will measure the 3D distribution of the dark matter component of the Universe with unprecedented sensitivity and sky coverage. This is a complementary probe to the CMB, since it traces the evolution of the Universe at low redshift.
The addition of the two probes will break degeneracies in the parameters which are left when using either CMB or large scale structure (LSS). Moreover, the contributions to the CMB anisotropies along the line-of- sight -the so-called secondary CMB anisotropies- are correlated with the growth of perturbations at low redshift. Therefore, we have an important information in addition to the simple combination of the CMB with large scale structure (LSS) probes from galaxy surveys: the cross-correlation be- tween the CMB and LSS probes, such as galaxy number counts and weak lensing. In this thesis, we study the capability of the CMB-LSS cross- correlation for constraining cosmological parameters alone or in combination with the CMB and LSS, using mock data and statistical methodologies, in the perspective of upcoming and future cosmological surveys.
Bibcode
José Ramón Bermejo Climent
Thesis advisor
José Alberto
Rubiño Martín
Dr.
Fabio Finelli
Advertised on:
10
2021
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