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Challenges in the hunt for dark energy dynamics
Includes bibliographical references. .
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Mathematics and Applied Mathematics
2016
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| _version_ | 1867613200294346752 |
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| access_status_str | Open Access |
| author | Hlozek, Renée |
| author2 | Bassett, Bruce |
| author_browse | Bassett, Bruce Hlozek, Renée |
| author_facet | Bassett, Bruce Hlozek, Renée |
| author_sort | Hlozek, Renée |
| collection | Thesis |
| description | Includes bibliographical references. . |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/19021 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:21.936Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| 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:11427/19021 Challenges in the hunt for dark energy dynamics Hlozek, Renée Bassett, Bruce Mathematics Includes bibliographical references. . One of the greatest challenges in modern cosmology is determining the origin of the observed acceleration of the Universe. The 'dark energy' believed to supply the negative pressure responsible for this cosmic acceleration remains elusive despite over a decade of investigation. Hunting for deviation from the 'vanilla' cosmological model, ACDM, and detecting dynamics with redshift in the equation of state remains a key research area, with many challenges. We introduce some of the challenges in the search for such dark energy dynamics. We illustrate that under the assumption of well-motivated scaling models for dark energy dynamics early universe constraints on the dark energy density imply that these models will be essentially indistinguishable from ACDM for the next decade. After introducing the Fisher Matrix formalism, we derive the Fisher Flex test as a measure of whether the assumption of Gaussianity in the likelihood is incorrect for parameter estimation. This formalism is general for any cosmological survey. Lastly, we study the degeneracies between dark energy and curvature and matter in a non-parametric approach, and show that incorrectly assuming values of cosmological components can exactly mimic dark energy dynamics. We connect to the parametric approach by showing how these uncertainties also degrade constraints on the dark energy parameters in an assumed functional form for w. Improving the accuracy of surveys and experiments to search for possible signatures of dark energy dynamics is the focus of much attention in contemporary cosmology; we highlight challenges in the hunt for dark energy dynamics. 2016-04-20T14:08:34Z 2016-04-20T14:08:34Z 2008 Master Thesis Masters MSc http://hdl.handle.net/11427/19021 eng application/pdf Department of Mathematics and Applied Mathematics Faculty of Science University of Cape Town |
| spellingShingle | Mathematics Hlozek, Renée Challenges in the hunt for dark energy dynamics |
| thesis_degree_str | Master's |
| title | Challenges in the hunt for dark energy dynamics |
| title_full | Challenges in the hunt for dark energy dynamics |
| title_fullStr | Challenges in the hunt for dark energy dynamics |
| title_full_unstemmed | Challenges in the hunt for dark energy dynamics |
| title_short | Challenges in the hunt for dark energy dynamics |
| title_sort | challenges in the hunt for dark energy dynamics |
| topic | Mathematics |
| url | http://hdl.handle.net/11427/19021 |
| work_keys_str_mv | AT hlozekrenee challengesinthehuntfordarkenergydynamics |