3 papers
gr-qc2025
Shock waves in classical dust collapse
Viqar Husain, Hassan Mehmood
During gravitational collapse of dust in spherical symmetry, matter particles may collide forming shell crossing surfaces (SCS) on which the Einstein equations become indeterminist…
gr-qc2024
An Exactly Soluble Group Field Theory
Luca Marchetti, Hassan Mehmood, Viqar Husain
We present a Group Field Theory (GFT) quantization of the Husain-Kuchař (HK) model formulated as a non-interacting GFT. We demonstrate that the path-integral formulation of this HK…
gr-qc2023
General covariance and dynamics with a Gauss law
Viqar Husain, Hassan Mehmood
We present a 4-dimensional generally covariant gauge theory which leads to the Gauss constraint but lacks both the Hamiltonian and spatial diffeomorphism constraints. The canonical…