Sökning: "f R gravity"

Hittade 3 uppsatser innehållade orden f R gravity.

1. 1. 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

3. 2. 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

4. 3. Potassium in the Galactic thin and thick discs

   Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

   Författare :Carina Norregaard; [2018]
   Nyckelord :Physics and Astronomy;

   Sammanfattning : To understand the evolution of our galaxy, the chemical abundance patterns and trends within the stars of the different regions are explored. The process of synthesizing these elements reveals key details about the way the stars and, therefore, the galaxy formed. LÄS MER