On the cosmology of scalar-tensor-vector gravity theory
We consider the cosmological consequences of a special scalar-tensor-vector theory of gravity, known as MOG in the literature, proposed to address the dark matter problem. This theory introduces two scalar fields $G(x)$ and $\mu(x)$, and one vector field $\phi_{\alpha}(x)$, in addition to the metric...
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| Main Authors: | , , |
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| Format: | Article (Journal) Chapter/Article |
| Language: | English |
| Published: |
10 Jul 2017
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| In: |
Arxiv
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| Online Access: | Verlag, kostenfrei, Volltext: http://arxiv.org/abs/1707.02841
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| Author Notes: | Sara Jamali, Mahmood Roshan and Luca Amendola |
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| 520 | |a We consider the cosmological consequences of a special scalar-tensor-vector theory of gravity, known as MOG in the literature, proposed to address the dark matter problem. This theory introduces two scalar fields $G(x)$ and $\mu(x)$, and one vector field $\phi_{\alpha}(x)$, in addition to the metric tensor. We set the corresponding self-interaction potentials to zero, as in the standard form of MOG. Then using the phase space analysis in the flat Friedmann-Robertson-Walker background, we show that the theory possesses a viable sequence of cosmological epochs with acceptable time dependency for the cosmic scale factor. We also investigate MOG's potential as a dark energy model and show that extra fields in MOG can not provide a late time accelerated expansion. Furthermore, using a dynamical system approach to solve the non-linear field equations numerically, we calculate the angular size of the sound horizon, i.e. $\theta_{\text{s}}$, in MOG. We find that $8\times 10^{-3}\text{rad}<\theta_{\text{s}}<8.2\times 10^{-3} \text{rad} $ which is way outside the current observational bounds. Finally we generalize MOG to find a model that passes the sound-horizon constraint and might produce a viable version of MOG. | ||
| 650 | 4 | |a cosmological model | |
| 650 | 4 | |a dark energy | |
| 650 | 4 | |a dark matter | |
| 650 | 4 | |a dynamical system | |
| 650 | 4 | |a expansion: acceleration | |
| 650 | 4 | |a expansion: background | |
| 650 | 4 | |a field equations: nonlinear | |
| 650 | 4 | |a field theory: scalar | |
| 650 | 4 | |a field theory: vector | |
| 650 | 4 | |a gravitation: model | |
| 650 | 4 | |a history | |
| 650 | 4 | |a horizon | |
| 650 | 4 | |a phase space: analysis | |
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