The Universe as a Domain Wall

Details The Universe as a Domain Wall The Universe as a Domain Wall

1998-03-27

arxiv.org/abs/hep-th/9803235v2

Phys.Rev.D59:086001,1999

Physics

High Energy Physics

High Energy Physics - Theory

18 pages, LATEX, typos corrected, footnotes and references added

Scientific paper

10.1103/PhysRevD.59.086001

It is shown that the effective five-dimensional theory of the strongly coupled heterotic string is a gauged version of N=1 five-dimensional supergravity with four-dimensional boundaries. For the universal supermultiplets, this theory is explicitly constructed by a generalized dimensional reduction procedure on a Calabi-Yau manifold. A crucial ingredient in the reduction is the retention of a "non-zero mode" of the four-form field strength, leading to the gauging of the universal hypermultiplet by the graviphoton. We show that this theory has an exact three-brane domain wall solution which reduces to Witten's "deformed" Calabi-Yau background upon linearization. This solution consists of two parallel three-branes with sources provided by the four-dimensional boundary theories and constitutes the appropriate background for a reduction to four dimensions. Four-dimensional space-time is then identified with the three-brane worldvolume.

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