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Void population in different cosmologies

Bixerman, K (2017) Void population in different cosmologies. Bachelor's Thesis, Astronomy.

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We use the Sheth-vdWeijgaert formalism to determine the void population for different cosmologies. We looked at an Einstein-deSitter universe for different powe -law power spectra and the LCDM scenario. The parameters in the Sheth-vdWeijgaert model were varied to look at the change on the void population. It was found that a change in the collapse-barrier only affect small voids whereas a change in the void-barrier affected both small and larger voids. The void population of the LCDM was compared with those found for the RP and SUGRA dark-energy models. The theoretical results are further compared with voids found in simulations using the WVF. We find that the dark-energy models rapidly diverge from the LCDM between a redshift of 0.2 and 2. Furthermore we find that the predicted results are confirmed by the analysis of the simulations. We also find that the while the WVF qualitatively recovers the void population predicted by theory, the degree of agreement does depends on the smoothing radius chosen.

Item Type: Thesis (Bachelor's Thesis)
Degree programme: Astronomy
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 15 Feb 2018 08:29
Last Modified: 15 Feb 2018 08:29

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