52 citations · 169 across the 11 of their papers we have counts for
11 papers
A short review on joint weak and strong cluster lens-mass reconstruction
Ben David Normann, Kenny Solevåg-Hoti, Hans Georg Schaathun
The distinction between weak and strong lensing is somewhat arbitrary, and both regimes are manifestations of the same physical phenomenon: gravity bending the path of light. Never…
On the simulation of gravitational lensing
Hans Georg Schaatun, Ben David Normann, Einar Leite Austnes +3
Gravitational lensing refers to the deflection of light by the gravity of celestial bodies, often predominantly composed of dark matter. Seen through a gravitational lens, the imag…
Can the Hubble tension be resolved by bulk viscosity?
Ben David Normann, Iver Håkon Brevik
We show that the cosmic bulk viscosity estimated in our previous works is sufficient to bridge the value inferred from observations of the early universe with the value infer…
Remarks on cosmological bulk viscosity in different epochs
Iver Brevik, Ben David Normann
The intention of this paper is mainly two-fold. \textit{First}, we point out a striking numerical agreement between the bulk viscosity in the lepton era calculated by Husdal (2016)…
Extended FLRW Models: dynamical cancellation of cosmological anisotropies
Mikjel Thorsrud, Ben D. Normann, Thiago S. Pereira
We investigate a corner of the Bianchi models that has not received much attention: "extended FLRW models" (eFLRW) defined as a cosmological model with underlying anisotropic Bianc…
Collins in Wonderland
Ben David Normann, Sigbjørn Hervik
What is the asymptotic future of a scalar-field model if the assumption of isotropy is relaxed in generic, homogeneous space-times with general relativity? This paper is a continua…
A study of inhomogeneous massless scalar gauge fields in cosmology
Ben David Normann, Sigbjørn Hervik, Angelo Ricciardone +1
Why is the Universe so homogeneous and isotropic? We summarize a general study of a -law perfect fluid alongside an inhomogeneous, massless scalar gauge field (with homogeneous…
Recursion relations for gravitational lensing
Ben David Normann, Chris Clarkson
The weak gravitational lensing formalism can be extended to the strong lensing regime by integrating a nonlinear version of the geodesic deviation equation. The resulting "roulette…
Bianchi cosmologies with -form gauge fields
Ben David Normann, Sigbjørn Hervik, Angelo Ricciardone +1
In this paper the dynamics of free gauge fields in Bianchi type I-VII space-times is investigated. The general equations for a matter sector consisting of a -form field st…
Characteristic Properties of Two Different Viscous Cosmology Models for the Future Universe
Ben David Normann, Iver Brevik
We analyze characteristic properties of two different cosmological models: (i) a one-component dark energy model where the bulk viscosity is associated with the fluid as a whol…
General Bulk-Viscous Solutions and Estimates of Bulk Viscosity in the Cosmic Fluid
Ben David Normann, Iver Brevik
We derive a general formalism for bulk viscous solutions of the energy-conservation-equation for , both for a single-component and a multicomponent fluid in the Friedmann u…