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Galaxies 2013, 1(1), 65-82; doi:10.3390/galaxies1010065

Cosmological Observations in a Modified Theory of Gravity (MOG)

1 Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L 2Y5, Canada 2 Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
* Author to whom correspondence should be addressed.
Received: 10 May 2013 / Accepted: 15 June 2013 / Published: 20 June 2013
(This article belongs to the Special Issue Cosmology with Fluid Components)
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Our Modified Gravity Theory (MOG) is a gravitational theory without exotic dark matter, based on an action principle. MOG has been used successfully tomodel astrophysical phenomena, such as galaxy rotation curves, galaxy cluster masses and lensing. MOG may also be able to account for cosmological observations. We assume that the MOG point source solution can be used to describe extended distributions of matter via an appropriately modified Poisson equation. We use this result to model perturbation growth in MOG and find that it agrees well with the observed matter power spectrum at present. As the resolution of the power spectrum improves with increasing survey size, however, significant differences emerge between the predictions of MOG and the standard Λ-cold dark matter (Λ-CDM) model, as in the absence of exotic darkmatter, oscillations of the power spectrum in MOG are not suppressed. We can also use MOG to model the acoustic power spectrum of the cosmic microwave background. A suitably adapted semi-analytical model offers a first indication that MOG may pass this test and correctly model the peak of the acoustic spectrum.
Keywords: cosmology theory; large-scale structure of Universe; gravitation cosmology theory; large-scale structure of Universe; gravitation
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Moffat, J.W.; Toth, V.T. Cosmological Observations in a Modified Theory of Gravity (MOG). Galaxies 2013, 1, 65-82.

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