Can hyperbolic phase of Brans - Dicke field account for Dark Matter?
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KünyeARIK, M., ÇALIK, M., ÇİFTER, F. (2009). Can hyperbolic phase of Brans - Dicke field account for Dark Matter. International Journal of Modern Physics D, 18 (4), pp. 587-597. http://dx.doi.org/10.1142/S0218271809014649.
We show that the introduction of a hyperbolic phase of the Brans-Dicke (BD) field results in a flat vacuum cosmological solution of the Hubble parameter H and a fractional rate of change of the BD scalar field F, which asymptotically approach constant values. At later stages, the hyperbolic phase of the BD field behaves like dark matter.