期刊
GENERAL RELATIVITY AND GRAVITATION
卷 35, 期 8, 页码 1511-1516出版社
KLUWER ACADEMIC/PLENUM PUBL
DOI: 10.1023/A:1024551105800
关键词
anisotropic cosmology; Born-Infeld theory
Anisotropic cosmological spacetimes are constructed from spherically symmetric solutions to Einstein's equations coupled to nonlinear electrodynamics and a positive cosmological constant. This is accomplished by finding solutions in which the roles of r and t are interchanged for all r > 0 (i.e. r becomes timelike and t becomes spacelike). Constant time hypersurfaces have topology R x S-2 and in all the spacetimes considered the radius of the two sphere vanishes as t goes to zero. The scale factor of the other dimension diverges as t goes to zero in some solutions and vanishes ( or goes to a constant) in other solutions. At late times local observers would see the universe to be homogeneous and isotropic.
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