140 citations · 1.2k across the 29 of their papers we have counts for
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gr-qc2010★ 58 cited
Coarse graining free theories with gauge symmetries: the linearized case
Benjamin Bahr, Bianca Dittrich, Song He
Discretizations of continuum theories often do not preserve the gauge symmetry content. This occurs in particular for diffeomorphism symmetry in general relativity, which leads to…
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-qc2010★ 25 cited
On knottings in the physical Hilbert space of LQG as given by the EPRL model
Benjamin Bahr
We consider the EPRL spin foam amplitude for arbitrary embedded two-complexes. Choosing a definition of the face- and edge amplitudes which lead to spin foam amplitudes invariant u…