Small Numbers from Tunneling Between Brane Throats

Details Small Numbers from Tunneling Between Brane Throats Small Numbers from Tunneling Between Brane Throats

2001-04-27

arxiv.org/abs/hep-th/0104239v3

Phys.Rev.D64:121702,2001

Physics

High Energy Physics

High Energy Physics - Theory

11 pages, 2 figures. Small corrections to match the published version

Scientific paper

10.1103/PhysRevD.64.121702

Generic classes of string compactifications include ``brane throats'' emanating from the compact dimensions and separated by effective potential barriers raised by the background gravitational fields. The interaction of observers inside different throats occurs via tunnelling and is consequently weak. This provides a new mechanism for generating small numbers in Nature. We apply it to the hierarchy problem, where supersymmetry breaking near the unification scale causes TeV sparticle masses inside the standard model throat. We also design naturally long-lived cold dark matter which decays within a Hubble time to the approximate conformal matter of a long throat. This may soften structure formation at galactic scales and raises the possibility that much of the dark matter of the universe is conformal matter. Finally, the tunnelling rate shows that the coupling between throats, mediated by bulk modes, is stronger than a naive application of holography suggests.

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