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Hittade 3 uppsatser som matchar ovanstående sökkriterier.

1. 1. A Tension between the Early and Late Universe: Could Our Underdense Cosmic Neighbourhood Provide an Explanation?

   Master-uppsats, Uppsala universitet/Institutionen för fysik och astronomi

   Författare :Sveva Castello; [2021]
   Nyckelord :Cosmology; Hubble tension; local void;

   Sammanfattning : In recent years, the increasingly precise constraints on the value of the Hubble constant, H0, have highlighted a discrepancy between the results arising from early-time and late-time measurements. A potential solution to this so-called Hubble tension is the hypothesis that we reside in a cosmic void, i.e. LÄS MER

3. 2. The Largest Void and Cluster in Non-Standard Cosmology

   L3-uppsats, Uppsala universitet/Teoretisk astrofysik

   Författare :Sveva Castello; [2020]
   Nyckelord :Cosmology; f R gravity; galaxy clusters; cosmic voids; extreme value statistics;

   Sammanfattning : We employ observational data about the largest cosmic void and most massive galaxy cluster known to date, the 'Cold Spot' void and the 'El Gordo' cluster, in order to constrain the parameter |fR0| from the f(R) gravity formulation by Hu and Sawicki and the matter power spectrum normalization at present time, σ8. We obtain the marginalized posterior distribution for these two parameters through a Markov Chain Monte Carlo analysis, where the likelihood function is modeled through extreme value statistics. LÄS MER

4. 3. Galaxy clusters and cosmic voids in modified gravity scenarios

   L3-uppsats, Uppsala universitet/Teoretisk astrofysik

   Författare :Sveva Castello; [2019]
   Nyckelord :Cosmology; galaxy clusters; cosmic voids; f R gravity;

   Sammanfattning : The so-called 'cosmic web', comprising cosmic voids and galaxy clusters, has been proven to be extremely sensitive to deviations from General Relativity. This could be further investigated by future large-scale surveys, such as with the European Space Agency satellite Euclid. LÄS MER