5 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…