PIRSA:08020047

Modified Gravity and Its Consequences for Astronomy, Astrophysics and Cosmology

Moffat, J. (2008). Modified Gravity and Its Consequences for Astronomy, Astrophysics and Cosmology. Perimeter Institute. https://pirsa.org/08020047

Moffat, John. Modified Gravity and Its Consequences for Astronomy, Astrophysics and Cosmology. Perimeter Institute, Feb. 19, 2008, https://pirsa.org/08020047 

          @misc{ pirsa_PIRSA:08020047,
            doi = {10.48660/08020047},
            url = {https://pirsa.org/08020047},
            author = {Moffat, John},
            keywords = {Particle Physics, Cosmology},
            language = {en},
            title = {Modified Gravity and Its Consequences for Astronomy, Astrophysics and Cosmology},
            publisher = {Perimeter Institute},
            year = {2008},
            month = {feb},
            note = {PIRSA:08020047 see, \url{https://pirsa.org}}
          }

John Moffat

Perimeter Institute for Theoretical Physics

Talk number
PIRSA:08020047
Collection
Talk Type
Subject
Abstract
The consequences of a modified gravity (MOG) are explored. I demonstrate how the solutions of the field equations obtained from the action principle of the MOG lead to a theory without any free, adjustable parameters or ad-hoc empirical formulae. The theory successfully explains solar system observations, the dispersion velocities of globular clusters, the rotation curves of galaxies, the mass profiles of X-ray clusters, the dispersion velocities of satellite galaxies, the Bullet Cluster and cosmological observations without exotic dark matter. The peculiar features of the recent data obtained for the merging cluster Abell 520 are discussed. MOG predicts agreement with data from the scale of the solar system to cosmological scales without dark matter. With no undetermined free parameters, the theory can be used to make firm predictions that may be verifiable in the foreseeable future.