74 citations · 690 across the 38 of their papers we have counts for
38 papers
Cosmologies with a magnetic field, dust, and Lambda
Martin Zofka, Kjell Rosquist
We investigate exact solutions of the Einstein-Maxwell equations with the cosmological constant where the source of the gravitational field consists of a magnetic field and dust. I…
Interacting Kerr-Newman Electromagnetic Fields
Sajad Aghapour, Lars Andersson, Kjell Rosquist +1
In this paper, we study some of the properties of the limit of the Kerr-Newman solution of Einstein-Maxwell equations. Noting Carter's observation of the near equality be…
Helicity, Spin, and Infra-zilch of Light: a Lorentz Covariant Formulation
Sajad Aghapour, Lars Andersson, Kjell Rosquist
In this paper, a novel conserved Lorentz covariant tensor, termed the helicity tensor, is introduced in Maxwell theory. The conservation of the helicity tensor expresses the conser…
Observational backreaction in discrete black holes lattice cosmological models
Daniele Gregoris, Kjell Rosquist
Applying the Sachs formalism, the optical properties encoded in the distance modulus are studied along curves exhibiting local rotational symmetry for some closed inhomogeneous cos…
The Zilch Electromagnetic Conservation Law Revisited
Sajad Aghapour, Lars Andersson, Kjell Rosquist
It is shown that the zilch conservation law arises as the Noether current corresponding to a variational symmetry of a duality-symmetric Maxwell Lagrangian. The action of the corre…
Twisted Gravitational Waves of Petrov Type D
Kjell Rosquist, Donato Bini, Bahram Mashhoon
Twisted gravitational waves (TGWs) are nonplanar unidirectional Ricci-flat solutions of general relativity. Thus far only TGWs of Petrov type \emph{II} are implicitly known that de…