3 papers
gr-qc2026
Causal structure and light-conical singularities in Lorentzian simplicial quantum gravity
Bianca Dittrich, José Padua-Argüelles
The definition of a Lorentzian gravitational path integral requires specifying which causal struc- tures are admitted off shell. Of particular importance are light-conical singular…
hep-th2025
Non-Perturbative -matrix Renormalization
Laurent Freidel, José Padua-Argüelles, Susanne Schander +1
We propose a renormalization group flow equation for a functional that generates -matrix elements and which captures similarities to the well-known Wetterich and Polchinski equa…
gr-qc2024
De Sitter horizon entropy from a simplicial Lorentzian path integral
Bianca Dittrich, Ted Jacobson, José Padua-Argüelles
The dimension of the Hilbert space of a quantum gravitational system can be written formally as a path integral partition function over Lorentzian metrics. We implement this in a 2…