Domain Walls As Probes Of Gravity

Details Domain Walls As Probes Of Gravity Domain Walls As Probes Of Gravity

2006-12-04

arxiv.org/abs/hep-th/0612016v1

Phys.Rev.D75:124013,2007

Physics

High Energy Physics

High Energy Physics - Theory

25 pages, 4 figures

Scientific paper

10.1103/PhysRevD.75.124013

We show that domain walls are probes that enable one to distinguish large-distance modified gravity from general relativity (GR) at short distances. For example, low-tension domain walls are stealth in modified gravity, while they do produce global gravitational effects in GR. We demonstrate this by finding exact solutions for various domain walls in the DGP model. A wall with tension lower than the fundamental Planck scale does not inflate and has no gravitational effects on a 4D observer, since its 4D tension is completely screened by gravity itself. We argue that this feature remains valid in a generic class of models of infrared modified gravity. As a byproduct, we obtain exact solutions for super-massive codimension-2 branes.

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