60 citations · 92 across the 3 of their papers we have counts for
3 papers
gr-qc2010★ 60 cited
Operator Spin Foam Models
Benjamin Bahr, Frank Hellmann, Wojciech Kamiński +2
The goal of this paper is to introduce a systematic approach to spin foams. We define operator spin foams, that is foams labelled by group representations and operators, as the mai…
gr-qc2008★ 2 cited
Partial Observables in Extended Systems
Frank Hellmann
We consider "unphysical", kinematic observables that do not commute with the constraints of a gauge system in the context of an extension of the system. We show that these observab…
gr-qc2006★ 30 cited
Multiple-event probability in general-relativistic quantum mechanics
Frank Hellmann, Mauricio Mondragon, Alejandro Perez +1
We discuss the definition of quantum probability in the context of "timeless" general--relativistic quantum mechanics. In particular, we study the probability of sequences of event…