Essays about: "modified cosmology"
Showing result 1 - 5 of 6 essays containing the words modified cosmology.
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1. Warm dark matter simulations and 21cm astronomy
University essay from Uppsala universitet/Institutionen för fysik och astronomiAbstract : The recent boom in 21cm astronomy has piqued the interest of many, especially cosmologists realizing its applications in their field. This study aims to determine if 21cm astronomy is a good tool for testing the validity of keV WDM models, as well as creating a code capable of simulating keV WDM models from an existing CDM code. READ MORE
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2. Planes of satellite galaxies
University essay from Lunds universitet/Astronomi - Genomgår omorganisationAbstract : The Planes of Satellites Problem is an open question within the field of galaxy formation. It is based on the observations that the Milky Way's satellites, as well as those around the Andromeda (M31) galaxy, align in planes. READ MORE
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3. The Largest Void and Cluster in Non-Standard Cosmology
University essay from Uppsala universitet/Teoretisk astrofysikAbstract : 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. READ MORE
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4. Galaxy clusters and cosmic voids in modified gravity scenarios
University essay from Uppsala universitet/Teoretisk astrofysikAbstract : 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. READ MORE
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5. Cosmological probes of the early universe with Axions & Gravitational Waves
University essay from Uppsala universitet/Teoretisk fysikAbstract : This thesis uses theoretical studies, and numerical simulations to provide results of the experimental reach to detect the QCD axion as dark matter in a Non-standard cosmological background. Assuming that the QCD axion constitutes the full CDM abundance of the universe, this thesis elaborates on its potential detection from experimental setups for the mass window of the axion. READ MORE