479 citations · 556 across the 9 of their papers we have counts for
9 papers
Non-minimal fluid Lagrangian couplings
Christian G. Boehmer, Erik Jensko, Eissa Al-Nasrallah
Gravitational models with non-minimal couplings involving functions of the matter Lagrangian and curvature have become popular in recent decades. By coupling the matter Lagrangian…
The choice of variables in cosmological dynamical systems
Christian G. Boehmer, Antonio d'Alfonso del Sordo
Dynamical systems techniques are a powerful tool to analyse systems of ordinary differential equations, written in an appropriate form. For a given theory of gravity, the cosmologi…
Dynamical systems approach to stellar modelling in gravity
Sudan Hansraj, Christian G. Boehmer, Ndumiso Buthelezi
The novel proposal to invoke the split of the Ricci scalar into bulk and boundary terms in the gravitational action, opens up a new avenue of investigation into stellar dynamics. T…
Azimuthal geodesics in closed FLRW cosmological models
Christian G. Boehmer, Antonio d'Alfonso del Sordo, Betti Hartmann +1
We study geodesics in Friedmann-Lema{\^ı}tre-Robertson-Walker (FLRW) cosmological models and give the full set of solutions. For azimuthal geodesics, in a closed universe, we give…
A new 2D formulation of modified General Relativity
Christian G. Boehmer, Erik Jensko
It is well known that the Einstein-Hilbert action in two dimensions is topological and yields an identically vanishing Einstein tensor. Consequently one is faced with difficulties…
Dynamical systems analysis of gravity
Christian G. Boehmer, Erik Jensko, Ruth Lazkoz
Modified gravity theories can be used for the description of homogeneous and isotropic cosmological models through the corresponding field equations. These can be cast into systems…
Modified gravity: a unified approach to metric-affine models
Christian G. Boehmer, Erik Jensko
The starting point of this work is the original Einstein action, sometimes called the Gamma squared action. Continuing from our previous results, we study various modified theories…
Compatibility conditions of continua using Riemann-Cartan geometry
Christian G. Boehmer, Yongjo Lee
The compatibility conditions for generalised continua are studied in the framework of differential geometry, in particular Riemann-Cartan geometry. We show that Vallée's compatibil…
Dynamical systems applied to cosmology: dark energy and modified gravity
Sebastian Bahamonde, Christian G. Boehmer, Sante Carloni +3
The Nobel Prize winning confirmation in 1998 of the accelerated expansion of our Universe put into sharp focus the need of a consistent theoretical model to explain the origin of t…