Cosmological observations in a modified theory of gravity (MOG)

Cosmological observations in a modified theory of gravity (MOG)
J.W. Moffat a,b , V.T. Toth a April 14, 2011
a Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L 2Y5, Canada
b Department of Physics, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada

The paper in question tells of the modified gravity theory or MOG as a theory devoid of exotic dark matter and that the authors have used the MOG to model galaxy cluster mass, rotational curves and lensing. They agree that adiabatic cold dark matter (ACDM) does indeed provide explanation cosmological phenomenon but in their opinion creates a massive discrepancy or hole in the universe. This hole or omission contends that roughly 95% of the matter in the universe is undetectable to us at this time. The authors claim that they can use their MOG to answer the problems encountered from the standard gravitational theory.
The modified theory of gravity is a theory full based on scalar, tensor and vector fields and it has evolved into Scalar-Tensor-Vector Gravity (STVG) theory. This in principle has stated that the dampened structure growth at low values of k and using a lesser effect of the Silk damping, a process which creates a more uniform density of the universe as well as Cosmic Microwave Background (CMB), are very similar to the calculations determined by the adiabatic cold dark matter theory. Though the do differ.

The MOG calculations are jagged than the predicted graphs of the ACDM. This is believed to have occurred due to the fact that much more data is required to fill and smooth the data series, as more and more galaxies are surveyed this is predicted to make the curve a better fit. There is also the problem of the dampened power spectrum at both high and low values of k as sub galactic distance scales are used. Over the MOG and CMB spectrum a change in the value of the Mukhanov’s constant produces similar results as the dark matter curves.

The authors are convinced that their Modified theory of Gravity (MOG) can indeed explain the discrepancies of Newtonian mechanics. It seems that just varying constants in the equations can indeed fit the observable data. As we, ourselves, have found out through our own homework calculations. Only time will tell.