Physics – General Physics
Scientific paper
2011-09-26
Physics
General Physics
Submitted to MNRAS (29 pages, 7 figures). In v2: corrected confusing statement concerning eq.(7); adjusted abstract slightly
Scientific paper
It is shown that so-called dark energy could possible be a manifestation of the gravitational vortex producing the 'gravitomagnetic' (GM) force field: associated with cosmic matter rotation and inertial spacetime frame dragging. The general relativistic Godel-Obukhov spacetime metric which incorporates expansion and rotation of the Universe is used to evaluate this force. This metric is expressed here in spherical comoving coordinates. Through a cosmic time-scale evolution, it is shown that cosmic acceleration is expected when the magnitude of the radial repulsive GM force exceeds that of the usual attractive gravitational 'gravitoelectric' (GE) force: associated with just cosmic matter and spacetime warping. In general, this phenomenon of cosmic accelerated expansion appears to have occurred twice in the history of the Universe: the inflationary phase and the present-day acceleration phase. It is suggested in this model that the two phases may or may not be related. The cosmological model presented here is described in the context of Einstein's Theory of General Relativity in Riemann-Cartan spacetime, which includes cosmic rotation, its effects, and it being considered as an intrinsic part of spacetime. Also, a derived analytical expression for the cosmic primordial magnetic field is presented; and how it might relate to the GM field through the spin density of the cosmic matter is discussed.
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