Analysing and predicting chaos from shocks and radiative cooling in simulations of cosmic structure formation

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dc.contributor.advisor Thacker, Robert John, 1970-
dc.creator Mungara, Paresh
dc.date.accessioned 2020-12-10T19:02:36Z
dc.date.available 2020-12-10T19:02:36Z
dc.date.issued 2020
dc.identifier.other QB857.5 E96 M86 2020
dc.identifier.uri http://library2.smu.ca/xmlui/handle/01/29478
dc.description xvi, 99 leaves : colour illustrations ; 29 cm
dc.description Includes abstract and appendix.
dc.description Includes bibliographical references (leaves 88-93).
dc.description.abstract It has long been appreciated that galaxy formation involves physics that can be subject to chaos. Numerical simulations introduce an additional source of noise in the form of approximations and floating point arithmetic errors. To date, there have been preliminary investigations into quantifying and characterizing the effects of both physical and numerical factors on simulation results, however, focusing on individual physical processes, such as shocks or radiative cooling, has been somewhat overlooked. In this thesis, we provide an analysis of the impact of shocks and radiative cooling in simulations of cosmic structure formation, by investigating a combination of phase space separation and density-phase space correlation. We have turned off other processes, such as star formation and feedback, to be able to focus on hydrodynamics with cooling alone. We find that regardless of cooling, galaxy mergers exhibit chaotic properties, however, cooling enables faster and stronger response to small initial changes. An initial hypothesis that high density regions should be more chaotic than low density regions is also shown to breakdown, especially at later times during the merger. Overall the development of differences in solutions is complex and involves distinct physical processes as well as mass scales. en_CA
dc.description.provenance Submitted by Greg Hilliard (greg.hilliard@smu.ca) on 2020-12-10T19:02:36Z No. of bitstreams: 1 Mungara_Paresh_MASTERS_2020.pdf: 2109121 bytes, checksum: 540132244605597e659d443b60284b35 (MD5) en
dc.description.provenance Made available in DSpace on 2020-12-10T19:02:36Z (GMT). No. of bitstreams: 1 Mungara_Paresh_MASTERS_2020.pdf: 2109121 bytes, checksum: 540132244605597e659d443b60284b35 (MD5) Previous issue date: 2020-11-20 en
dc.language.iso en en_CA
dc.publisher Halifax, N.S. : Saint Mary's University
dc.subject.lcc QB857.5.E96
dc.subject.lcsh Galaxies -- Formation -- Mathematical models
dc.subject.lcsh Hydrodynamics
dc.subject.lcsh Cooling
dc.subject.lcsh Chaotic behavior in systems
dc.title Analysing and predicting chaos from shocks and radiative cooling in simulations of cosmic structure formation en_CA
dc.type Text en_CA
thesis.degree.name Master of Science in Astronomy
thesis.degree.level Masters
thesis.degree.discipline Astronomy and Physics
thesis.degree.grantor Saint Mary's University (Halifax, N.S.)
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