Selva, Giada (2025) In the Shape of Emptiness: Dark Energy and the Evolution of Voids in the Homogeneous Ellipsoidal Model. Bachelor's Thesis, Astronomy.
|
Text
ThesisastronomyGiadaSelva.pdf Download (28MB) | Preview |
|
![[img]](https://fse.studenttheses.ub.rug.nl/style/images/fileicons/text.png) |
Text
Toestemming.pdf Restricted to Registered users only Download (195kB) |
Abstract
In this thesis, a numerical solver was developed for the homogeneous ellipsoidal model, capable of evolving arbitrary initial conditions for isolated voids or overdensities. The solver tracks the time evolution of the principal axes of ellipsoidal regions, allowing for a detailed study of their shape dynamics over cosmic time. The model isolates and quantifies the contributions of three fundamental physical forces: self-gravity, the tidal fields, and dark energy contribution. A striking result of this analysis is the clear separation of their roles: dark energy, when acting alone, contributes only to isotropic expansion, uniformly expanding the void without altering its shape. In contrast, the tidal field causes the anisotropy, deforming the void as it evolves. In the final part of the study, model predictions are compared against data extracted from the TNG50 cosmological simulation. This comparison serves as a test of the model's validity and highlights both its strengths and limitations when applied to realistic cosmic environments. The results demonstrate that the model reproduces key trends observed in the simulation, particularly the emergence of anisotropy in void evolution, while also suggesting directions for future refinement and extension.
| Item Type: | Thesis (Bachelor's Thesis) |
|---|---|
| Supervisor name: | Weijgaert, M.A.M. van de |
| Degree programme: | Astronomy |
| Thesis type: | Bachelor's Thesis |
| Language: | English |
| Date Deposited: | 22 Jul 2025 12:27 |
| Last Modified: | 22 Jul 2025 12:27 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/36406 |
Actions (login required)
 |
View Item |