Singularity resolution from polymer quantum matter
  We study the polymeric nature of quantum matter fields using the example of a
Friedmann-Lemaitre-Robertson-Walker universe sourced by a minimally coupled
massless scalar field. The model is treated in the symmetry reduced regime via
deparametrization techniques, with the scale factor playing the role of time.
Subsequently, the remaining dynamic degrees of freedom corresponding to the
matter are polymer quantized. The analysis of the resulting genuine quantum
dynamic shows that the big bang singularity is resolved, although with the form
of the resolution differing significantly from that in the models with matter
clocks: dynamically, the singularity is made passable rather than avoided.
Furthermore, this analysis exposes crucial limitations to the so-called
effective dynamic in loop quantum cosmology when applied outside of the most
basic isotropic settings.
