Kantowski-Sachs String Cosmologies

Details Kantowski-Sachs String Cosmologies Kantowski-Sachs String Cosmologies

1996-08-20

arxiv.org/abs/hep-th/9608136v1

Phys.Rev. D55 (1997) 630-638

Physics

High Energy Physics

High Energy Physics - Theory

23 pages, REVTEX, 6 figures available on request

Scientific paper

10.1103/PhysRevD.55.630

We present new exact solutions of the low-energy-effective-action string equations with both dilaton $\phi $ and axion $H$ fields non-zero. The background universe is of Kantowski-Sachs type. We consider the possibility of a pseudoscalar axion field $h$ ($H=e^\phi (dh)^{*}$) that can be either time or space dependent. The case of time-dependent $h$ reduces to that of a stiff perfect-fluid cosmology. For space-dependent $h$ there is just one non-zero time-space-space component of the axion field $H$, and this corresponds to a distinguished direction in space which prevents the models from isotropising. Also, in the latter case, both the axion field $H$ and its tensor potential $B$ ($H=dB$) are dependent on time and space yet the energy-momentum tensor remains time-dependent as required by the homogeneity of the cosmological model.

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