Kaluza-Klein bubble like structure and celestial sphere in inflationary universe

Details Kaluza-Klein bubble like structure and celestial sphere in inflationary universe Kaluza-Klein bubble like structure and celestial sphere in inflationary universe

2004-06-22

arxiv.org/abs/hep-th/0406181v3

Gen.Rel.Grav. 37 (2005) 1823-1831

Physics

High Energy Physics

High Energy Physics - Theory

5pages, 4figures, to be published in GRG

Scientific paper

10.1007/s10714-005-0162-4

We consider five dimensional deSitter spacetimes with a deficit angle due to the presence of a closed 2-brane and identify one dimension as an extra dimension. From the four dimensional viewpoint we can see that the spacetime has a structure similar to a Kaluza-Klein bubble of nothing, that is, four dimensional spacetime ends at the 2-brane. Since a spatial section of the full deSitter spacetime has the topology of a sphere, the boundary surface surrounds the remaining four dimensional spacetime, and can be considered as the celestial sphere. After the spacetime is created from nothing via an instanton which we describe, some four dimensional observers in it see the celestial sphere falling down, and will be in contact with a 2-brane attached on it.

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