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Single-Fluid Approach to Modeling Dark Matter and Dark Energy
Cosmological observations over the past decades have provided overwhelming evidence for the ex istence of dark energy, a mysterious and dominant component responsible for the accelerated expan sion of the universe. The nature of dark energy remains one of the most intriguing puzzles in modern cosmol...
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| Format: | Thesis |
| Language: | English |
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Department of Mathematics and Applied Mathematics
2025
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| _version_ | 1867613312914554880 |
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| access_status_str | Open Access |
| author | Pillay, Vineshree |
| author2 | Dunsby, Peter |
| author_browse | Dunsby, Peter Pillay, Vineshree |
| author_facet | Dunsby, Peter Pillay, Vineshree |
| author_sort | Pillay, Vineshree |
| collection | Thesis |
| description | Cosmological observations over the past decades have provided overwhelming evidence for the ex istence of dark energy, a mysterious and dominant component responsible for the accelerated expan sion of the universe. The nature of dark energy remains one of the most intriguing puzzles in modern cosmology. This dissertation presents a comprehensive investigation into the class of Unified Dark Energy Models (UDE), which offer a novel approach to understanding the nature of dark energy by unifying it with other cosmic components, in our case dark matter. The first part of this work reviews the theoretical background and observational evidence for dark energy, highlighting the challenges posed by the cosmological constant and other early models. Next, we present an in-depth analysis of various Unified Dark Energy Models proposed in the literature. The Generalized Chaplygin gas and the Logotropic model. Furthermore, we explore the impact of Unified Dark Energy Models on the large-scale structure of the universe and its evolution at the perturbed level. Following this review we look at a newly proposed equation of state "The Murnaghan equation of state" which accounts for both pressure and matter in the early universe, and exhibits Chaplygin-like behaviour in the later universe. The findings of this study contribute significantly to our understanding of dark energy and its interactions with other cosmic components. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/41232 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:34:08.683Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2025 |
| publishDateRange | 2025 |
| publishDateSort | 2025 |
| publisher | Department of Mathematics and Applied Mathematics |
| publisherStr | Department of Mathematics and Applied Mathematics |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/41232 Single-Fluid Approach to Modeling Dark Matter and Dark Energy Pillay, Vineshree Dunsby, Peter Luongo, Orlando Cosmology and Gravity Group Cosmological observations over the past decades have provided overwhelming evidence for the ex istence of dark energy, a mysterious and dominant component responsible for the accelerated expan sion of the universe. The nature of dark energy remains one of the most intriguing puzzles in modern cosmology. This dissertation presents a comprehensive investigation into the class of Unified Dark Energy Models (UDE), which offer a novel approach to understanding the nature of dark energy by unifying it with other cosmic components, in our case dark matter. The first part of this work reviews the theoretical background and observational evidence for dark energy, highlighting the challenges posed by the cosmological constant and other early models. Next, we present an in-depth analysis of various Unified Dark Energy Models proposed in the literature. The Generalized Chaplygin gas and the Logotropic model. Furthermore, we explore the impact of Unified Dark Energy Models on the large-scale structure of the universe and its evolution at the perturbed level. Following this review we look at a newly proposed equation of state "The Murnaghan equation of state" which accounts for both pressure and matter in the early universe, and exhibits Chaplygin-like behaviour in the later universe. The findings of this study contribute significantly to our understanding of dark energy and its interactions with other cosmic components. 2025-03-25T06:44:37Z 2025-03-25T06:44:37Z 2024 2025-03-25T06:43:45Z Thesis / Dissertation Masters MSc http://hdl.handle.net/11427/41232 eng application/pdf Department of Mathematics and Applied Mathematics Faculty of Science University of Cape Town |
| spellingShingle | Cosmology and Gravity Group Pillay, Vineshree Single-Fluid Approach to Modeling Dark Matter and Dark Energy |
| thesis_degree_str | Master's |
| title | Single-Fluid Approach to Modeling Dark Matter and Dark Energy |
| title_full | Single-Fluid Approach to Modeling Dark Matter and Dark Energy |
| title_fullStr | Single-Fluid Approach to Modeling Dark Matter and Dark Energy |
| title_full_unstemmed | Single-Fluid Approach to Modeling Dark Matter and Dark Energy |
| title_short | Single-Fluid Approach to Modeling Dark Matter and Dark Energy |
| title_sort | single fluid approach to modeling dark matter and dark energy |
| topic | Cosmology and Gravity Group |
| url | http://hdl.handle.net/11427/41232 |
| work_keys_str_mv | AT pillayvineshree singlefluidapproachtomodelingdarkmatteranddarkenergy |