Năstase, Maria-Ruxandra (2024) On the Path to Cosmic Web Genesis. Bachelor's Thesis, Physics.
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Abstract
The goal of this research was to analyse mass transport in Cosmic Web environments from early, proto-structure redshifts to present time. Following the rationale of anisotropic gravitational collapse, the Zel’dovich approximation defines a clear sequence of mass migration based on deformation tensor eigenvalues. Particles move from underdense regions into denser ones, i.e. from voids to their surrounding walls, to the filaments that interconnect them and finally end up in highly dense clusters. To investigate this phenomenon, data from the Illustris 3 Dark simulation was processed with the Delaunay Tesselation Field Estimator (DTFE) and with the NEXUS+ programs developed by Marius Cautun. With DTFE the discrete data-point data from Illustris was converted to a continuously defined density field which allowed a higher resolution analysis and maintained geometrical and hierarchical information about the density distribution, crucial for NEXUS+ characterisation. Subsequently, using the density field as input, NEXUS+ was able to identify the various morphological components (walls, filaments, clusters and voids) in a scale-independent manner at each point in the field. Finally, a script was created that allowed the association of an Illustris particle ID with its NEXUS+ identified environment tag. This made it possible to follow the evolution as well as to observe the history of mass flow for each environment. [...]
| Item Type: | Thesis (Bachelor's Thesis) |
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| Supervisor name: | Weijgaert, M.A.M. van de and Dimastrogiovanni, E. |
| Degree programme: | Physics |
| Thesis type: | Bachelor's Thesis |
| Language: | English |
| Date Deposited: | 15 Jul 2024 09:27 |
| Last Modified: | 15 Jul 2024 09:27 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/33306 |
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