Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-04-07
Phys.Lett. B482 (2000) 183-194
Physics
High Energy Physics
High Energy Physics - Theory
LaTeX2e, 17 pages; Revised (references added, physics unchanged). To appear in Physics Letters B
Scientific paper
10.1016/S0370-2693(00)00520-7
We sketch a particularly simple and compelling version of D-brane cosmology. Inspired by the semi-phenomenological Randall--Sundrum models, and their cosmological generalizations, we develop a variant that contains a single (3+1)-dimensional D-brane which is located on the boundary of a single bulk (4+1)-dimensional region. The D-brane boundary is itself to be interpreted as our visible universe, with ordinary matter (planets, stars, galaxies) being trapped on this D-brane by string theory effects. The (4+1)-dimensional bulk is, in its simplest implementation, adS_{4+1}, anti-de Sitter space. We demonstrate that a k=+1 closed FLRW universe is the most natural option, though the scale factor could quite easily be so large as to make it operationally indistinguishable from a k=0 spatially flat universe. (With minor loss of elegance, spatially flat and hyperbolic FLRW cosmologies can also be accommodated.) We demonstrate how this model can be made consistent with standard cosmology, and suggest some possible observational tests.
Barcelo Carlos
Visser Matt
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