109 citations · 294 across the 9 of their papers we have counts for
9 papers
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…
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…
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…
Einstein's equations and the chiral model
Viqar Husain
The vacuum Einstein equations for spacetimes with two commuting spacelike Killing field symmetries are studied using the Ashtekar variables. The case of compact spacelike hypersurf…
Exact solutions for null fluid collapse
Viqar Husain
Exact non-static spherically symmetric solutions of the Einstein equations for a null fluid source with pressure and density related by are given. The metr…
Radiation collapse and gravitational waves in three dimensions
Viqar Husain
Two non-static solutions for three dimensional gravity coupled to matter fields are given. One describes the collapse of radiation that results in a black hole. This is the three d…
Exact solution for scalar field collapse
Viqar Husain, Erik A. Martinez, Dario Nunez
We give an exact spherically symmetric solution for the Einstein-scalar field system. The solution may be interpreted as an inhomogeneous dynamical scalar field cosmology. The spac…
Observables for spacetimes with two Killing field symmetries
Viqar Husain
The Einstein equations for spacetimes with two commuting spacelike Killing field symmetries are studied from a Hamiltonian point of view. The complexified Ashtekar canonical variab…
General covariance, loops and matter
Viqar Husain
A four dimensional generally covariant field theory is presented which describes non-dynamical three geometries coupled to scalar fields. The theory has an infinite number of physi…