185 citations
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hep-th2008★ 31 cited
Spatially asymptotic S-matrix from general boundary formulation
Daniele Colosi, Robert Oeckl
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…
hep-th2007★ 28 cited
S-matrix at spatial infinity
Daniele Colosi, Robert Oeckl
We provide a new method to construct the S-matrix in quantum field theory. This method implements crossing symmetry manifestly by erasing the a priori distinction between in- and o…
hep-th2005★ 30 cited
States on timelike hypersurfaces in quantum field theory
Robert Oeckl
We investigate the possibility of defining states on timelike hypersurfaces in quantum field theory. To this end we consider hyperplanes in the real massive Klein-Gordon theory usi…