Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2002-04-10
Phys.Rev. D66 (2002) 106005
Physics
High Energy Physics
High Energy Physics - Theory
30 pages, RevTex file, five postscript figure files
Scientific paper
10.1103/PhysRevD.66.106005
We consider quantum field theory on a spacetime representing the Big Crunch/Big Bang transition postulated in the ekpyrotic or cyclic cosmologies. We show via several independent methods that an essentially unique matching rule holds connecting the incoming state, in which a single extra dimension shrinks to zero, to the outgoing state in which it re-expands at the same rate. For free fields in our construction there is no particle production from the incoming adiabatic vacuum. When interactions are included the total particle production for fixed external momentum is finite at tree level. We discuss a formal correspondence between our construction and quantum field theory on de Sitter spacetime.
Tolley Andrew J.
Turok Neil
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