Modified Newtonian dynamics at all astrophysical scales

Galactic dynamics;Dark matter(Astronomy);Gravitation;Neutrinos

Angus, Garry W. ; Zhao, Hongsheng ; Zhao, Hongsheng

University:University of St Andrews

Department:Physics & Astronomy (School of)

关键词: Galactic dynamics;    Dark matter(Astronomy);    Gravitation;    Neutrinos;   

Others  :  https://research-repository.st-andrews.ac.uk/bitstream/handle/10023/530/Garry%20William%20Angus%20PhD%20thesis.pdf?sequence=3&isAllowed=y

来源: DR-NTU

【 摘 要 】

In this thesis I test the modified Newtonian dynamics as an alternative to the colddark 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 globularclusters provide a strong test, for which I make predictions. Through analysis of a sample of 26 X-ray bright galaxy groups andclusters I demonstrate that the three active neutrinos and their anti-particles are insufficient to reconcilemodified Newtonian dynamics with the observed temperatures of the X-ray emitting gas, norwith weak-lensing measurements, in particular for the bullet cluster. To this end, I propose an 11eV sterile neutrino toserendipitously resolve the residual mass problem in X-ray bright groups and clusters,as well as matching the angular power spectrum of the Cosmic MicrowaveBackground. 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 thanin standard dynamics.