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Modified Newtonian dynamics at all astrophysical scales

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Garry William Angus PhD thesis.pdf (2.746Mb)
Date
27/11/2008
Author
Angus, Garry W.
Supervisor
Zhao, Hongsheng
Keywords
Galaxy dynamics
Cosmology
Alternative gravity
MOND
Dwarf galaxies
CMB
Cosmic microwave background
Sterile neutrinos
Clusters of galaxies
Milgrom
Modified dynamics
Dark matter
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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.
Type
Thesis, PhD Doctor of Philosophy
Collections
  • Physics & Astronomy Theses
URI
http://hdl.handle.net/10023/530

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