Regular Article – Theoretical Physics
Gravitational theory of cosmology, galaxies and galaxy clusters
Perimeter Institute for Theoretical Physics, N2L 2Y5, Waterloo, ON, Canada
2 Department of Physics and Astronomy, University of Waterloo, N2L 3G1, Waterloo, ON, Canada
Accepted: 16 September 2020
Published online: 1 October 2020
A modified gravitational theory explains early universe and late time cosmology, galaxy and galaxy cluster dynamics. The modified gravity (MOG) theory extends general relativity (GR) by three extra degrees of freedom: a scalar field G, enhancing the strength of the Newtonian gravitational constant , a gravitational, spin 1 vector graviton field , and the effective mass of the ultralight spin 1 graviton. For , where denotes the time of recombination and re-ionization, the density of the vector graviton , where is the density of baryons, while for we have . The matter density is parameterized by where . For the cosmological parameter values obtained by the Planck Collaboration, the CMB acoustical oscillation power spectrum, polarization and lensing data can be fitted as in the CDM model. When the baryon density dominates the late time universe, MOG explains galaxy rotation curves, the dynamics of galaxy clusters, galaxy lensing and the galaxy clusters matter power spectrum without dominant dark matter.
© The Author(s) 2020. corrected publication 2020
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