176 citations · 1.5k across the 58 of their papers we have counts for
58 papers
Bouncing Bianchi Models with Deformed Commutation Relations
Gabriele Barca, Steffen Gielen
We study the anisotropic Bianchi I and Bianchi II models in vacuum in the framework of deformed commutation relations (DCRs). Working in a parametrisation of the spatial metric by…
Cosmological scalar perturbations for a metric reconstructed from group field theory
Steffen Gielen, Lisa Mickel
While homogeneous cosmologies have long been studied in the group field theory (GFT) approach to quantum gravity, including a quantum description of cosmological perturbations is h…
Hilbert space formalisms for group field theory
Steffen Gielen
Group field theory is a background-independent approach to quantum gravity whose starting point is the definition of a quantum field theory on an auxiliary group manifold (not inte…
Relational dynamics and Page-Wootters formalism in group field theory
Andrea Calcinari, Steffen Gielen
Group field theory posits that spacetime is emergent and is hence defined without any background notion of space or time; dynamical questions are formulated in relational terms, in…
Reconstructing the metric in group field theory
Steffen Gielen, Lisa Mickel
We study a group field theory (GFT) for quantum gravity coupled to four massless scalar fields, using these matter fields to define a (relational) coordinate system. We exploit sym…
Generalised Gaussian states in group field theory and quantum cosmology
Andrea Calcinari, Steffen Gielen
We define generalised Gaussian states for quantum cosmological models based on the algebra, with particular emphasis on its realisation in group field theory f…