Use this URL to cite or link to this record in EThOS:
Title: Numerical modeling of modified Newtonian dynamics in galaxies : testing the external field effects
Author: Xufen, Wu
ISNI:       0000 0004 2720 1275
Awarding Body: University of St Andrews
Current Institution: University of St Andrews
Date of Award: 2010
Availability of Full Text:
Access from EThOS:
Access from Institution:
Galaxies are natural laboratories for testing fundamental physics on the nature of the dark matter. MOdified Newtonian Dynamics (MOND) has been tested for over 20 years on small and large scales. While there are several versions of how MOND extrapolates to the large scales, and these versions are not yet fully successful, the original Bekenstein-Milgrom version of MOND is fully predictive and works very well on galaxy scales. However, little work has been done to explore this theory beyond fitting the rotation curves and Tully-Fisher relation of isolated disc galaxies. So far little is known of MONDian elliptical galaxies accelerating in any galaxy cluster. A defining feature of MOND is that internal dynamics of the galaxy depends on the overall acceleration of the galaxy. The existence of cuspy triaxial equilibria for elliptical galaxies is the minimal requirement to MOND. With the PhD project here, I constructed and then further studied the evolution and stability of gravitationally bound systems resembling like cuspy elliptical galaxies, both in isolation and when embedded in a uniform external field. I also studied the escape speeds from spiral galaxies, in particular by comparing the potentials of the Milky Way Galaxy in the Cold Dark Matter (CDM) and MOND frameworks.
Supervisor: HongSheng, Zhao Sponsor: Scottish Universities Physics Alliance
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Galaxies ; kinematics and dynamics ; Methods ; N-body simulations ; Gravitation ; Modified gravity ; QB857.W8 ; Galactic dynamics--Mathematical models