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Thursday, 24 January 2008, 13:30 in SSB7172
Prof. John Moffat (University of Toronto/Perimeter)
Modified gravity and its consequences for astronomy, astrophysics and cosmology
The consequences of a modified gravity (MOG) are explored. The theory successfully explains the dispersion velocities of globular clusters, the rotation curves of galaxies, the mass profiles of x-ray clusters, the Bullet Cluster and cosmological observations without exotic dark matter. An explanation of the accelerated expansion of the universe is obtained from the MOG field equations without Einstein's cosmological constant. I demonstrate how the solutions of the field equations can be derived directly from the action principle of the theory, without resorting to ad-hoc parameter choices of empirical formulae. After the values of integration constants are determined from observation, approximate solutions to the field equations of MOG are obtained that show excellent agreement with the data from the scale of the solar system to cosmological scales. With no undetermined free parameters, the theory can be used to make firm predictions that may be verifiable in the foreseeable future.
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Modified by Andrei Frolov <frolov@sfu.ca> on 2023-11-01