165 citations · 252 across the 6 of their papers we have counts for
6 papers
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…
Combinatorics of n-point functions via Hopf algebra in quantum field theory
Angela Mestre, Robert Oeckl
We use a coproduct on the time-ordered algebra of field operators to derive simple relations between complete, connected and 1-particle irreducible n-point functions. Compared to t…
The general boundary approach to quantum gravity
Robert Oeckl
We present an approach to quantum gravity based on the general boundary formulation of quantum mechanics, path integral quantization, spin foam models and renormalization.
A "general boundary" formulation for quantum mechanics and quantum gravity
Robert Oeckl
I propose to formalize quantum theories as topological quantum field theories in a generalized sense, associating state spaces with boundaries of arbitrary (and possibly finite) re…
Schroedinger's cat and the clock: Lessons for quantum gravity
Robert Oeckl
I review basic principles of the quantum mechanical measurement process in view of their implications for a quantum theory of general relativity. It turns out that a clock as an ex…
Quantum fields and quantum groups
Christian Brouder, Robert Oeckl
Quantum fields are shown to provide an example of infinite-dimensional quantum groups. A dictionary is established between quantum field and quantum group concepts: the expectation…