Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-12-30
Grav.Cosmol.14:235-240,2008
Physics
High Energy Physics
High Energy Physics - Theory
13 pages, LaTex, no figures
Scientific paper
10.1134/S0202289308030055
Electric S-brane solutions with two non-composite electric branes and a set of l scalar fields are considered. The intersection rules for branes correspond to Lie algebras A_2, C_2 and G_2. The solutions contain five factor spaces. One of them, M_0, is interpreted as our 3-dimensional space. It is shown that there exists a time interval where accelerated expansion of our 3-dimensional space is compatible with a small enough variation of the effective gravitational constant G(\tau). This interval contains \tau_0, a point of minimum of the function G(\tau). A special solution with two phantom scalar fields is analyzed and it is shown that in the vicinity of the point \tau_0 the time variation of G(\tau) (calculated in the linear approximation) decreases in the sequence of Lie algebras A_2, C_2 and G_2.
Ivashchuk Vladimir D.
Kononogov S. A.
Melnikov Vitaly N.
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