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Constructing realistic Szekeres models from initial and final data
The Szekeres family of inhomogeneous solutions, which are defined by six arbitrary metric functions, offers a wide range of possibilities for modelling cosmic structure. Within this family, the quasispherical case is the best understood, and is interpreted as being an arrangement on non-concentric m...
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| Format: | Thesis |
| Language: | English |
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Department of Mathematics and Applied Mathematics
2015
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| _version_ | 1867613186668101632 |
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| access_status_str | Open Access |
| author | Walters, Anthony Paul |
| author2 | Hellaby, Charles |
| author_browse | Hellaby, Charles Walters, Anthony Paul |
| author_facet | Hellaby, Charles Walters, Anthony Paul |
| author_sort | Walters, Anthony Paul |
| collection | Thesis |
| description | The Szekeres family of inhomogeneous solutions, which are defined by six arbitrary metric functions, offers a wide range of possibilities for modelling cosmic structure. Within this family, the quasispherical case is the best understood, and is interpreted as being an arrangement on non-concentric mass shells, each a density dipole. Here we present a model construction procedure for the quasispherical case using given data at initial and final times. Of the six arbitrary metric functions, the three which are common to both Szekeres and Lemaitre-Tolman models are determined by the model construction procedure of Krasinski & Hellaby. For the remaining three functions, which are unique to Szekeres models, we derive exact analytic expressions in terms of more physically intuitive quantities - density profiles and dipole orientation angles. Using MATLAB, we implement the model construction procedure and simulate the time evolution. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/14382 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:08.355Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| 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:11427/14382 Constructing realistic Szekeres models from initial and final data Walters, Anthony Paul Hellaby, Charles Mathematics and Applied Mathematics The Szekeres family of inhomogeneous solutions, which are defined by six arbitrary metric functions, offers a wide range of possibilities for modelling cosmic structure. Within this family, the quasispherical case is the best understood, and is interpreted as being an arrangement on non-concentric mass shells, each a density dipole. Here we present a model construction procedure for the quasispherical case using given data at initial and final times. Of the six arbitrary metric functions, the three which are common to both Szekeres and Lemaitre-Tolman models are determined by the model construction procedure of Krasinski & Hellaby. For the remaining three functions, which are unique to Szekeres models, we derive exact analytic expressions in terms of more physically intuitive quantities - density profiles and dipole orientation angles. Using MATLAB, we implement the model construction procedure and simulate the time evolution. 2015-10-28T05:29:57Z 2015-10-28T05:29:57Z 2012 Master Thesis Masters MSc http://hdl.handle.net/11427/14382 eng application/pdf Department of Mathematics and Applied Mathematics Faculty of Science University of Cape Town |
| spellingShingle | Mathematics and Applied Mathematics Walters, Anthony Paul Constructing realistic Szekeres models from initial and final data |
| thesis_degree_str | Master's |
| title | Constructing realistic Szekeres models from initial and final data |
| title_full | Constructing realistic Szekeres models from initial and final data |
| title_fullStr | Constructing realistic Szekeres models from initial and final data |
| title_full_unstemmed | Constructing realistic Szekeres models from initial and final data |
| title_short | Constructing realistic Szekeres models from initial and final data |
| title_sort | constructing realistic szekeres models from initial and final data |
| topic | Mathematics and Applied Mathematics |
| url | http://hdl.handle.net/11427/14382 |
| work_keys_str_mv | AT waltersanthonypaul constructingrealisticszekeresmodelsfrominitialandfinaldata |