Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.552163
Title: Modified Newtonian dynamics at all astrophysical scales
Author: Angus, Garry W.
Awarding Body: University of St Andrews
Current Institution: University of St Andrews
Date of Award: 2008
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Abstract:
In this thesis I test the modified Newtonian dynamics as an alternative to the cold dark matter hypothesis. In the Milky Way, I show that the dynamics of the dwarf galaxies are well described by the paradigm and I confirm its distant low surface brightness globular clusters provide a strong test, for which I make predictions. Through analysis of a sample of 26 X-ray bright galaxy groups and clusters I demonstrate that the three active neutrinos and their anti-particles are insufficient to reconcile modified Newtonian dynamics with the observed temperatures of the X-ray emitting gas, nor with weak-lensing measurements, in particular for the bullet cluster. To this end, I propose an 11eV sterile neutrino to serendipitously resolve the residual mass problem in X-ray bright groups and clusters, as well as matching the angular power spectrum of the Cosmic Microwave Background. With this in mind, I show that the large collision velocity of the bullet cluster and the high number of colliding clusters is more naturally reproduced in MOND than in standard dynamics.
Supervisor: Zhao, HongSheng Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.552163  DOI: Not available
Keywords: Galaxy dynamics ; Cosmology ; Alternative gravity ; MOND ; Dwarf galaxies ; CMB ; Cosmic microwave background ; Sterile neutrinos ; Clusters of galaxies ; Milgrom ; Modified dynamics ; Dark matter ; QB856.A6 ; Galactic dynamics ; Dark matter(Astronomy) ; Gravitation ; Neutrinos
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