Hochart, Erwan (2020) Cosmic Web Classification: NEXUS+ vs. DisPerSE. Bachelor's Thesis, Astronomy.
|
Text
Bachelor_Thesis___Cosmic_Web_Analysis___Erwan_Hochart.pdf Download (63MB) | Preview |
|
![[img]](https://fse.studenttheses.ub.rug.nl/style/images/fileicons/text.png) |
Text
toestemming.pdf Restricted to Registered users only Download (98kB) |
Abstract
By describing the matter distribution of the Universe at the largest of scales, ingrained within the cosmic web is an abundance of information on the history of structure formation within our Universe. However, due to its non-linear nature and ambiguous definitions in defining the different constituents, cosmologists have difficulty analysing the cosmic web, leaving essential information out of reach. Over the decade’s numerous formalisms have been developed to try and extract this hidden information. The report focuses on two formalisms, namely DisPerSE and NEXUS+, and begins with dissecting the mathematical formalisms they incorporate in their algorithm. More explicitly, DisPerSE uses a topological approach in its analysis of the cosmic web while NEXUS+ adopts a scale-space approach. After building up the required knowledge to get a grasp on the algorithm and how they differ, simulations were conducted on a pre-defined Universe to compare both qualitative and quantitative results. The results found that although DisPerSE is more mathematically robust, it has issues when tracing the different environments due to its topological approach being unable to preserve the shape and size of the various constituents. Contrariwise, results showed that NEXUS+ was successful in the delineation of the environments and rendered better results due to its geometrical approach in identifying the different regions resulting in better quantitative results as well.
| Item Type: | Thesis (Bachelor's Thesis) |
|---|---|
| Supervisor name: | Weijgaert, M.A.M. van de and Dayal, P. |
| Degree programme: | Astronomy |
| Thesis type: | Bachelor's Thesis |
| Language: | English |
| Date Deposited: | 09 Jul 2020 15:40 |
| Last Modified: | 09 Jul 2020 15:40 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/22546 |
Actions (login required)
 |
View Item |