Di Gesu, Giuseppe Nazareno
(2024)
Testing a specific implementation of the Alcock-Paczyński test on the Magneticum simulations.
[Laurea magistrale], Università di Bologna, Corso di Studio in
Astrofisica e cosmologia [LM-DM270]
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Abstract
In cosmology, accurately determining the parameters of a given model is essential for properly inferring the evolution of the universe and explaining its observable characteristics. The ΛCDM (Λ-cold dark matter) model, widely considered in cosmology, predicts the existence of three fundamental components: matter (comprising both dark and baryonic matter), radiation, and the cosmological constant (Λ). Each of these components contributes to the total density of the universe. To quantify these contributions, we usually use density parameters. In this thesis, our aim has been to test the efficiency of a particular method for determining the matter density parameter, called the Alcock-Paczyński (AP) test. We took advantage of the geometric anisotropies inherent in the two-point correlation function of different simulated cosmic tracers, which emerged from the assumption of a wrong cosmology when calculating the comoving distances. We employed a particular method to conduct the AP test while modeling the anisotropic distortions involving a Boltzmann solver.
Abstract
In cosmology, accurately determining the parameters of a given model is essential for properly inferring the evolution of the universe and explaining its observable characteristics. The ΛCDM (Λ-cold dark matter) model, widely considered in cosmology, predicts the existence of three fundamental components: matter (comprising both dark and baryonic matter), radiation, and the cosmological constant (Λ). Each of these components contributes to the total density of the universe. To quantify these contributions, we usually use density parameters. In this thesis, our aim has been to test the efficiency of a particular method for determining the matter density parameter, called the Alcock-Paczyński (AP) test. We took advantage of the geometric anisotropies inherent in the two-point correlation function of different simulated cosmic tracers, which emerged from the assumption of a wrong cosmology when calculating the comoving distances. We employed a particular method to conduct the AP test while modeling the anisotropic distortions involving a Boltzmann solver.
Tipologia del documento
Tesi di laurea
(Laurea magistrale)
Autore della tesi
Di Gesu, Giuseppe Nazareno
Relatore della tesi
Scuola
Corso di studio
Ordinamento Cds
DM270
Parole chiave
Alcock-Paczyński test cosmology geometric distorsions magneticum simulations
Data di discussione della Tesi
19 Luglio 2024
URI
Altri metadati
Tipologia del documento
Tesi di laurea
(NON SPECIFICATO)
Autore della tesi
Di Gesu, Giuseppe Nazareno
Relatore della tesi
Scuola
Corso di studio
Ordinamento Cds
DM270
Parole chiave
Alcock-Paczyński test cosmology geometric distorsions magneticum simulations
Data di discussione della Tesi
19 Luglio 2024
URI
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