35 citations · 277 across the 22 of their papers we have counts for
22 papers
The near equilibrium Einstein-Boltzmann system with a simplified collision term
Philip Semrén, Michael Bradley, João M. S. Oliveira +1
A simplified relativistic kinetic theory for gases with internal degrees of freedom, based on a BGK-type collision term, is considered. First the Boltzmann equation is rewritten in…
General Perturbations of Homogeneous and Orthogonal Locally Rotationally Symmetric Class II Cosmologies with Applications to Dissipative Fluids
Philip Semrén, Michael Bradley
First order perturbations of homogeneous and hypersurface orthogonal LRS (Locally Rotationally Symmetric) class II cosmologies with a cosmological constant are considered in the fr…
General Perfect Fluid Perturbations of Homogeneous and Orthogonal Locally Rotationally Symmetric Class II Cosmologies
Robin Törnkvist, Michael Bradley
First order perturbations of homogeneous and hypersurface orthogonal LRS (Locally Rotationally Symmetric) class II cosmologies with a cosmological constant are considered in the fr…
Gravitational Waves in Locally Rotationally Symmetric (LRS) Class II Cosmologies
Michael Bradley, Mats Forsberg, Zoltán Keresztes
In this work we consider perturbations of homogeneous and hypersurface orthogonal cosmological backgrounds with local rotational symmetry (LRS), using a method based on the 1 + 1 +…
Gravitational, shear and matter waves in Kantowski-Sachs cosmologies
Zoltán Keresztes, Mats Forsberg, Michael Bradley +2
A general treatment of vorticity-free, perfect fluid perturbations of Kantowski-Sachs models with a positive cosmological constant are considered within the framework of the 1+1+2…
Symmetry analysis of radiative spacetimes with a null isotropy using GHP formalism
S. Brian Edgar, Michael Bradley, M. Piedade Machado Ramos
A complete and simple invariant classification of the conformally flat pure radiation metrics with a negative cosmological constant that were obtained by integration using the gene…