Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-02-15
Phys.Rev.D78:025020,2008
Physics
High Energy Physics
High Energy Physics - Theory
27 pages, LaTeX + revtex4; v2: various corrections, references updated
Scientific paper
10.1103/PhysRevD.78.025020
We construct a new type of S-matrix in quantum field theory using the general boundary formulation. In contrast to the usual S-matrix the space of free asymptotic states is located at spatial rather than at temporal infinity. Hence, the new S-matrix applies to situations where interactions may remain important at all times, but become negligible with distance. We show that the new S-matrix is equivalent to the usual one in situations where both apply. This equivalence is mediated by an isomorphism between the respective asymptotic state spaces that we construct. We introduce coherent states that allow us to obtain explicit expressions for the new S-matrix. In our formalism crossing symmetry becomes a manifest rather than a derived feature of the S-matrix.
Colosi Daniele
Oeckl Robert
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