3 papers
gr-qc2026
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-qc2025
On weak solutions in Einstein theory and beyond
Francesco Fazzini, Hassan Mehmood
In spherical symmetry, gravitational collapse of dust may give rise to the so-called shell-crossing singularities, beyond which spacetime can be extended using weak solutions to th…
gr-qc2025
An Exactly Soluble Group Field Theory
Luca Marchetti, Hassan Mehmood, Viqar Husain
We present a Group Field Theory (GFT) quantization of the Husain-KuchaÅ (HK) model formulated as a non-interacting GFT. We demonstrate that the path-integral formulation of this H…